Not knowing your specific heatsink, or how the fan is mounted to it, I can't really make any specific recommendations.

However, yes, you can replace it with anything you like.

Most CPU fans plug into the motherboard with a standard 3-pin header that's still commonly used today. Just measure your fan and find one that fits your needs. Power should not be a problem.

For CPU or case fans, it's not an issue to replace with modern fans like Noctuas. Typical Socket 370 heatsinks would likely have used a 60mm fan, as that was a standard size used at the time. You'll want to measure it just to make sure.

PSU fans can be a little more challenging. Partially it depends on the internal plug (I've had to rewire connectors for replacements) and also minimum load. Modern quiet fans typically draw less current, but too low a current draw can sometimes prevent PSU fans from spinning.

If possible, I would consider just replacing the entire PSU with a modern one.

StriderTR wrote on 2024-09-23, 22:09:

Not knowing your specific heatsink, or how the fan is mounted to it, I can't really make any specific recommendations.

However, yes, you can replace it with anything you like.

Most CPU fans plug into the motherboard with a standard 3-pin header that's still commonly used today. Just measure your fan and find one that fits your needs. Power should not be a problem.

I took few pictures of 370 socket heatsink. Honestly the complete noise is too much to bear. I got used so much to the Be Quiet PSU and silent fan i have on my "new old" computer.
I`ll try to replace these fans as soon as possible as my number one priority. Next would be good GPU, and soundcard as starting point.

Shponglefan wrote on 2024-09-23, 22:11:

For CPU or case fans, it's not an issue to replace with modern fans like Noctuas. Typical Socket 370 heatsinks would likely have used a 60mm fan, as that was a standard size used at the time. You'll want to measure it just to make sure.

PSU fans can be a little more challenging. Partially it depends on the internal plug (I've had to rewire connectors for replacements) and also minimum load. Modern quiet fans typically draw less current, but too low a current draw can sometimes prevent PSU fans from spinning.

If possible, I would consider just replacing the entire PSU with a modern one.

Fan seems to be 6.6/7 mm size when i measured it right know, but that is with the fan sides. I posted pictures in comments above.
As for PSU i thought new silent one are incompatible with old computers due to different rail sizes and -5 voltage presented in older units, but if that is possibility, yes i would love to replace it with new one if it will work for this old computer and have all connections needed, plus to be silent.

I want to upgrade this computer as much as i can to enjoy it bit more in 2024, as stated before better GPU and soundcard, preferablly better case if i can find small one that will manage me to fit all components inside.
But for know my first priorities are dealing with the noisy fans. If you happen to know where i can order worldwide new PSU for this old machine feel free to share. 😀
Thanks for all infos provided so far.

I will post few more pictures of the computer. 😀

Post some pictures of your CPU heatsink/cooler, if possible.

If the heatsink is large enough, you can slow down the original fan via either 3-pin resistor adapters or direct "hot-wiring" of the fan for 5V or 7V operation. I did the latter (7V operation) on my Pentium III 933 MHz CPU, simply by taking the negative (black) wire out of the fan connector and wiring it to the 5V rail. This gives a difference of 12-5 = 7V going to the fan. Just beware that doing this will make the fan tachometer (RPM) not visible to the motherboard anymore. On the other hand, wiring the fan directly to 5V (via connecting the red wire to 5V and leaving the black wire normal) won't have this issue.

Then again, if the original heatsink fan is loud due to worn out bearings, then you should replace it indeed. Most socket 370 coolers came with 50 mm fans and a few with 60 mm fans. 70 mm fans are rare, but not non-existent. On that note, and depending on how handy you are, you can also go with the option to adapt a 70 or 80 mm fan to your current cooler via 3D printing or just cobbling something together out of common materials. I've done the latter many times. It never won any beauty contests, but is effective and allows me to use my large stock of 80 mm fans... and at a lower voltage for the same airflow, making the systems nearly silent.

As for the PSU, perhaps also post a picture of it, or rather its label. Or at least tell us the brand and model #. Some cheap PSUs from that era wired their fans directly to 12V, so always sounded loud. Normally cheap PSUs like that are not worth re-using (they tend to suffer from bad caps, among other issues), but a few worthwhile ones do come up every now and then that are worthy of a recap (and fan silencing 😉 ).
In any case, don't replace your original PSU with a modern one just quite yet. I see this advice given here very often, but depending on which part of the world you live, or in particular what brands of PSUs are commonly available there, you might be in for more trouble with the new PSUs. If you go with a decent brand like EVGA, Antec, Corsair and similar and a model that has a 5V rail rating capable of at least 15 Amps, that would be fine. But if you go with a modern "no-name" PSU, it's probably going to be a 12V-based group regulated design that will likely not play well with your PIII PC. So just be aware of that.

*EDIT*
Ah, you're ahead of me already and posted pictures of the system - cool! 😀

Yep, that P3 cooler looks large enough that you can just slow down the fan via voltage mods to make it more quite. Try the "7V" mod first (remove black wire from fan connector and wire it to a red wire on a molex connector or similar.) Should still keep the CPU plenty cool and won't sound like a jet engine anymore. Even a 5V mod might be OK with this fan, being a 70 mm fan. But before jumping to that, see how hot the CPU gets with the 7V mod first. I'd be surprised if it goes above 40C under full load with this cooler. Pentium 3 CPUs top out at around 35-ish Watts, so they are not exactly hard to cool.

As for the power supply... I see it's a Q-tec, which I don't recall running into off top of my head. But it's a generic brand probably made by one of the less-than-stellar cheapo OEMs like Deer/Solytech, Codegen, Linkworld, and etc. A picture of it with its top cover removed (disconnect from wall AC power before doing this [!!!] ) should tell us more if it's OK to re-use or not... tough I suspect even if it is, it will probably need a recap already or at some future point not too long from now.

Finally, in regards to video cards...
I think a Radeon 9600 or 9550 (128-bit memory bus version) would be a pretty sensible step-up and likely not too expensive or hard to find in your country. Avoid stepping up to Radeon 9700 or 9800 video cards, though - these run hot and rarely last long... not to mention they draw a lot of power from the 5V rail, which will make finding a new PSU (if it comes to that) even harder.
Alternatively, if you prefer to step into the nVidia side of things, a GeForce 4200TI or an FX5600 would also be a good fit for this system. Only problem with these is that they have become a little more expensive and not as easy to find as the Radeon 9550/9600.
Going beyond these, you'll be mostly getting bottlenecked by the CPU, so probably not worth it. But if sticking with Windows XP, a cheaper GeForce 6600LE (instead of a GT) could also be used.

momaka wrote on 2024-09-24, 00:32:

Post some pictures of your CPU heatsink/cooler, if possible. […]
Show full quote

Post some pictures of your CPU heatsink/cooler, if possible.

If the heatsink is large enough, you can slow down the original fan via either 3-pin resistor adapters or direct "hot-wiring" of the fan for 5V or 7V operation. I did the latter (7V operation) on my Pentium III 933 MHz CPU, simply by taking the negative (black) wire out of the fan connector and wiring it to the 5V rail. This gives a difference of 12-5 = 7V going to the fan. Just beware that doing this will make the fan tachometer (RPM) not visible to the motherboard anymore. On the other hand, wiring the fan directly to 5V (via connecting the red wire to 5V and leaving the black wire normal) won't have this issue.

Then again, if the original heatsink fan is loud due to worn out bearings, then you should replace it indeed. Most socket 370 coolers came with 50 mm fans and a few with 60 mm fans. 70 mm fans are rare, but not non-existent. On that note, and depending on how handy you are, you can also go with the option to adapt a 70 or 80 mm fan to your current cooler via 3D printing or just cobbling something together out of common materials. I've done the latter many times. It never won any beauty contests, but is effective and allows me to use my large stock of 80 mm fans... and at a lower voltage for the same airflow, making the systems nearly silent.

As for the PSU, perhaps also post a picture of it, or rather its label. Or at least tell us the brand and model #. Some cheap PSUs from that era wired their fans directly to 12V, so always sounded loud. Normally cheap PSUs like that are not worth re-using (they tend to suffer from bad caps, among other issues), but a few worthwhile ones do come up every now and then that are worthy of a recap (and fan silencing 😉 ).
In any case, don't replace your original PSU with a modern one just quite yet. I see this advice given here very often, but depending on which part of the world you live, or in particular what brands of PSUs are commonly available there, you might be in for more trouble with the new PSUs. If you go with a decent brand like EVGA, Antec, Corsair and similar and a model that has a 5V rail rating capable of at least 15 Amps, that would be fine. But if you go with a modern "no-name" PSU, it's probably going to be a 12V-based group regulated design that will likely not play well with your PIII PC. So just be aware of that.

I posted pictures in previous comments of 370 socket fan. And you are right, i think the design originaly is bit wobbly how it attches to CPU. As for fans the more silent it is, the better, if its bit expensive and be solution for a lifetime i would get it someday. Noctua small fans can cost around 20 euros those small 6mm 3 pins, i guess that would be my best solution.

My goal would be to slowly upgrade what is possible to upgrade since i think Motherboard is pretty flexible for Pentium III.
So you are saying i can buy new Corsair or Antec that would work with my old computer? Thats sound like a good deal.

Here are some pictures of my current PSU. Thanks for your reply so far.

OK, in regards to the Q-tec PSU... ADT-300 model number suggests CWT (Channel Well Technology) is probably the OEM. CWT is large OEM and they do make good PSUs (many of the old Corsairs from the CX line). This is probably from the budget "ISO" line, though, so YMMV in regards to what's inside in terms of quality. At the very best, though, you'll be dealing with Fuhjyyu electrolytic capacitors (which aren't any good in these PSUs.) An indeed the cheaper ISO line units don't usually have a fan controller and run their fan at full tilt on 12V. So a new fan in the PSU probably won't solve the noise issue. Instead, you'd need to do more modding there... but that may or may not be something (technical) you want to dig into.

As for video card suggestion, see my edited post above. Seems like my edit is slower than your reply. 😉

Studiostriver wrote on 2024-09-24, 00:53:

As for fans the more silent it is, the better, if its bit expensive and be solution for a lifetime i would get it someday. Noctua small fans can cost around 20 euros those small 6mm 3 pins, i guess that would be my best solution.

Well, I've never personally used Noctua fans, but I know they are well regarded here. So if price is not that much of a concern, then you can go with them. AFAIK, they usually come with a resistor adapter (or two?) to slow them down further, so that makes it possible to make them even more quiet.

Studiostriver wrote on 2024-09-24, 00:53:

So you are saying i can buy new Corsair or Antec that would work with my old computer? Thats sound like a good deal.

Yes. Just check that the 5V rail rating is capable of at least 15 Amps. Given it's a Pentium III CPU, even 12 Amps should work in a pinch... but that's as close as I would cut it. As for the PSU power / Watt rating, that's not really important. A PIII system typically uses about 40-50ish Watts tops with onboard or low-end GPU (like that Radeon 9250, for example.)

Studiostriver wrote on 2024-09-24, 00:21:

Fan seems to be 6.6/7 mm size when i measured it right know, but that is with the fan sides. I posted pictures in comments above.

I saw the pics and it looks it's a stock cooler with a clip-on fan. Not sure if that heatsink can accomodate a screw-on fan like a Noctua. You could consider replacing both the heatsink and fan, or you might have to get creative with attaching a replacement fan to the heatsink.

edited to add:

The above suggestion of slowing the stock fan could also work. I've never tried rewiring the fan as suggested, but another option is to put a resistor in the line to reduce current.

Back in the day, variable fan controllers were just that, variable resistors which impeded current and slowed down fan speed.

As for PSU i thought new silent one are incompatible with old computers due to different rail sizes and -5 voltage presented in older units, but if that is possibility, yes i would love to replace it with new one if it will work for this old computer and have all connections needed, plus to be silent.

It depends. I know there are some early ATX boards which might have issues with modern PSUs (IIRC, I ran into this issue with a Slot 1 board) so YMMV. Insofar as -5V , that's typically only needed for older ISA cards such as certain sound cards.

If your PSU is working and in good condition (i.e. putting out stable voltages, no bulging caps) then it's probably fine to replace the fan. I would look for a fan that uses approximately the same current draw just to ensure it will spin up properly in the PSU.

Shponglefan wrote on 2024-09-24, 01:07:

I saw the pics and it looks it's a stock cooler with a clip-on fan. Not sure if that heatsink can accomodate a screw-on fan like […]
Show full quote

Studiostriver wrote on 2024-09-24, 00:21:

Fan seems to be 6.6/7 mm size when i measured it right know, but that is with the fan sides. I posted pictures in comments above.

I saw the pics and it looks it's a stock cooler with a clip-on fan. Not sure if that heatsink can accomodate a screw-on fan like a Noctua. You could consider replacing both the heatsink and fan, or you might have to get creative with attaching a replacement fan to the heatsink.

edited to add:

The above suggestion of slowing the stock fan could also work. I've never tried rewiring the fan as suggested, but another option is to put a resistor in the line to reduce current.

Back in the day, variable fan controllers were just that, variable resistors which impeded current and slowed down fan speed.

As for PSU i thought new silent one are incompatible with old computers due to different rail sizes and -5 voltage presented in older units, but if that is possibility, yes i would love to replace it with new one if it will work for this old computer and have all connections needed, plus to be silent.

It depends. I know there are some early ATX boards which might have issues with modern PSUs (IIRC, I ran into this issue with a Slot 1 board) so YMMV. Insofar as -5V , that's typically only needed for older ISA cards such as certain sound cards.

If your PSU is working and in good condition (i.e. putting out stable voltages, no bulging caps) then it's probably fine to replace the fan. I would look for a fan that uses approximately the same current draw just to ensure it will spin up properly in the PSU.

I guess i`ll have to find a repair guy who will somehow find a way to mount a fan without screws, or to order new heatsing on which will be easier to mount new fan. Man i now it would not be easy task. 🙁

If you can recomend me good new PSU that will work well , i think i have no one who will properly mod this PSU , replacing caps etc, i just want to replace fan, but its pretty hard task fo me since i`m not into such a things, i only like to play video games, haha. 😀

So i guess buying new PSU what would work well with would be better solution, if i can get my hands on it. If you have certain models that are know to work silent, or special silent models please let me know.

Studiostriver wrote on 2024-09-24, 00:53:

As for fans the more silent it is, the better, if its bit expensive and be solution for a lifetime i would get it someday. Noctua small fans can cost around 20 euros those small 6mm 3 pins, i guess that would be my best solution.

Well, I've never personally used Noctua fans, but I know they are well regarded here. So if price is not that much of a concern, then you can go with them. AFAIK, they usually come with a resistor adapter (or two?) to slow them down further, so that makes it possible to make them even more quiet.

I guess i`ll go with it then, i hope my tech will have no problem mounting it on this old heatsink. You know i`m far from rich man, but i hate noise so much that i`ll rather live bit harder few weeks here on Balkan then that i`ll have to deal with it any longer. 🙁
This model i think will be ok to get?
https://noctua.at/en/products/fan/nf-a6x25-flx

Studiostriver wrote on 2024-09-24, 00:53:

So you are saying i can buy new Corsair or Antec that would work with my old computer? Thats sound like a good deal.

Yes. Just check that the 5V rail rating is capable of at least 15 Amps. Given it's a Pentium III CPU, even 12 Amps should work in a pinch... but that's as close as I would cut it. As for the PSU power / Watt rating, that's not really important. A PIII system typically uses about 40-50ish Watts tops with onboard or low-end GPU (like that Radeon 9250, for example.)
[/quote]

I wish you can make me exact model of new PSU which should be safe to buy. I`m not a tech guy and i know nothing about things you talking to me, i just want to make stable configuration so i know it will serve in me in years to come ocassionaly when i dive into old games. 😀

Buying a new cooler is not too awful, socket 370 is relatively common. AMD Socket A/462 heatsinks are compatible. And at least in the US, they are relatively available new old stock and used for cheap.

If you are shelling out for Noctuas already, I believe the 3 pin ones come with a little 3 pin to 3 pin fan extension that cuts speed, you could use it on that stock cooler, but IMHO, I would just look for a new cooler.

wallythander wrote on 2024-09-24, 01:35:

Buying a new cooler is not too awful, socket 370 is relatively common. AMD Socket A/462 heatsinks are compatible. And at least in the US, they are relatively available new old stock and used for cheap.

If you are shelling out for Noctuas already, I believe the 3 pin ones come with a little 3 pin to 3 pin fan extension that cuts speed, you could use it on that stock cooler, but IMHO, I would just look for a new cooler.

I can probably order new old stock on ebay, but i guess easier fix would be to put small Noctua fan there if my tech will managage to do that judging that it has no place for screws.

Most convenient and probably cheapest solutions have already been pointed out, imo (and even period accurate answers if that's even of any interest to you OP):

A socket 462/ socket A cooler, from Thermaltake or Titan for example - they have much beefier heatsinks (and copper bases) and bigger fans than a run of the mill socket 370 cooler, plus they're perfectly compatible with no modding needed. They're even easier to find with the three hooks to attach to the socket more evenly and spread the load all around. Bigger heatsink, plus the copper base and bigger fan means you can run the fan much lower/quieter than would be needed with a socket 370 basic cooler without compromising anything, and not hard to find at all.

As for the speed of that fan, Gelid fan controllers are cheap and available from Germany for example (get some spares while you're at it if you think you may get a little more into the hobby). Install the cooler and test it in BIOS and with Everest in Windows while/after running some stuff and check the temps, then slow the fan with the Gelid controller until you find the best balance between temps and fan noise. You'll see that with the socket 462/A cooler you'll be able to get the fan noise down to a low level, especially for a retro build.

Your GPU is already passively cooled from what I can see so that box's ticked, as for power any modern ATX PSU from the better known brands will be fine and will have quieter fans than a PSU from the era. I have EVGA bronze PSUs, any other models/brands should be perfectly fine, you can even oil them further if you like.

In my own experience of what I've described my builds are not silent of course, but I can assure you they run pretty quiet. Of course you can get Noctuas for everything and call it a day, I just thought I'd reinforce the recommendation of a simple, ready-made and cheap way to go about this, while using original parts. Either way you'll get there. Best of luck!

Studiostriver wrote on 2024-09-24, 01:20:

I guess i`ll have to find a repair guy who will somehow find a way to mount a fan without screws, or to order new heatsing on which will be easier to mount new fan. Man i now it would not be easy task. 🙁

Or here's the easier alternative: re-use the old fan with a speed controller.

For the purpose, you can use either this:
https://www.ebay.com/itm/156370695273

Or this:
https://www.ebay.com/itm/365083000194

For the 2nd one above, get the "white" extension resistor cable, as that one has the lowest resistance (27 Ohms). This will slow down the fan the least. However, since this is a 5-piece kit, if one of these extension resistor cables does not slow down the fan enough for you needs, then daisy-chain two of them and you will get pretty close to what the "red" one is offering.
The item from the 2nd link above will also allow you to keep your motherboard RPM monitoring on the CPU fan.

Or if you want to be real fancy, you can use one of these to control up to 8 fans in your system and you get to adjust the sped to your liking:
https://www.ebay.com/itm/296704957066

*EDIT*
Wow, what's happened to just getting a single channel 3-pin fan controller? Seems like those have gone the way of the Dodo bird. Kind of pisses me off your can get all these multi-channel PC fan controllers, but you can't get just a simple series 1-fan controller. Oh, and 1st thing ebay and AliExp. seem to shove my way is silly ARGB controllers.
/rant

Studiostriver wrote on 2024-09-24, 01:20:

If you can recomend me good new PSU that will work well , i think i have no one who will properly mod this PSU , replacing caps etc, i just want to replace fan, but its pretty hard task fo me since i`m not into such a things, i only like to play video games, haha. 😀

Gotcha.
Well, I haven't bought a new PSU in ages. Actually, last and only new PSU I bought was 20 years ago. Everything else since then has been used (and most have been picked with issues on purpose, just to fix them up for fun... but I get that's not what you're digging for.) With that said, I don't know how good my recommendations would be... and anyone here is welcome to comment on that... but here is what I found so far that should work OK for your system:
https://www.evga.com/products/product.aspx?pn=100-N1-0400-L1
https://www.evga.com/products/product.aspx?pn=100-BR-0450-K1
https://www.antec.com/product/power/vp550p-plus
https://www.antec.com/product/power/csk-450-bronze

I haven't looked at Corsair or Thermaltake yet to see what they have to offer... or some of the newer brands that I keep forgetting about. Either way, all of these newer PSUs should be way more quiet than the old one, since they use bigger fans and also have fan controllers.

andre_6 wrote on 2024-09-24, 19:10:

Most convenient and probably cheapest solutions have already been pointed out, imo (and even period accurate answers if that's e […]
Show full quote

Most convenient and probably cheapest solutions have already been pointed out, imo (and even period accurate answers if that's even of any interest to you OP):

A socket 462/ socket A cooler, from Thermaltake or Titan for example - they have much beefier heatsinks (and copper bases) and bigger fans than a run of the mill socket 370 cooler, plus they're perfectly compatible with no modding needed. They're even easier to find with the three hooks to attach to the socket more evenly and spread the load all around. Bigger heatsink, plus the copper base and bigger fan means you can run the fan much lower/quieter than would be needed with a socket 370 basic cooler without compromising anything, and not hard to find at all.

As for the speed of that fan, Gelid fan controllers are cheap and available from Germany for example (get some spares while you're at it if you think you may get a little more into the hobby). Install the cooler and test it in BIOS and with Everest in Windows while/after running some stuff and check the temps, then slow the fan with the Gelid controller until you find the best balance between temps and fan noise. You'll see that with the socket 462/A cooler you'll be able to get the fan noise down to a low level, especially for a retro build.

Your GPU is already passively cooled from what I can see so that box's ticked, as for power any modern ATX PSU from the better known brands will be fine and will have quieter fans than a PSU from the era. I have EVGA bronze PSUs, any other models/brands should be perfectly fine, you can even oil them further if you like.

In my own experience of what I've described my builds are not silent of course, but I can assure you they run pretty quiet. Of course you can get Noctuas for everything and call it a day, I just thought I'd reinforce the recommendation of a simple, ready-made and cheap way to go about this, while using original parts. Either way you'll get there. Best of luck!

Those are all pretty healthy recommendations! I will try to look for that on ebay. 😀 Getting passive completely passive cooling for CPU sound like a nice thing. I plan sometimes to get update for 1.4Ghz model just to get best performance possible from Pentium III machine. I will get new PSU , thats for sure.
And recently got update on GPU Asus ASUS Radeon 9250 Video Card A9250/GE/TD/256. So far it runs good on old drivers and grapchic update on XP games are pretty noticeable.
Weird thing that happen to me recently is that ive found PCI USB 2.0 card and after literaly 4 days it stopped working and saying it malfunction, cant read any of usbs.

Thanks for all info provided once, more.

Spending on Noctua would be waste of money as the fans themselves are not better than the alternatives, and for the same amount of money as getting a whole new heatsink, you'd still be stuck with that tiny heatsink with those Noctuas.
Get some kind of a heatsink that fits 80mm fans and replace the fan with something far better for this use, such as P8 silent.
Also, if you have access to 3D printing it's really easy to print a 50/60mm -> 80mm adapter, too, so you can do away with something that only fits 50/60mm fans.

A001 wrote on 2024-09-26, 19:38:

Spending on Noctua would be waste of money as the fans themselves are not better than the alternatives, and for the same amount of money as getting a whole new heatsink, you'd still be stuck with that tiny heatsink with those Noctuas.
Get some kind of a heatsink that fits 80mm fans and replace the fan with something far better for this use, such as P8 silent.
Also, if you have access to 3D printing it's really easy to print a 50/60mm -> 80mm adapter, too, so you can do away with something that only fits 50/60mm fans.

I have different experience on my "new computers" Be Quite and Noctua fans i honestly cant hear at all, only if i concetrate really hard. But i will take your advice in consideration. I have already heatsink, but maybe bigge would be better idea since i plan to put 1.4ghz CPU in a future. Complete silent passive cooling with one big as Andre 6 suggested sounds like a cool idea if it will cool down enough processor.

And no i have no access to 3D printing, nor anyone in my town, dare i say most part of the country is doing that. I live in South Europe, very poor place in general. Its science fiction thing here for most of the people.
I doing this old Pentium Project cause i wanted to have one that is really good as kid but always has extremly poor specifications, so i plan to make one solid enough to make games i used to play as kid. 😉
Dual boot machine is bit more complicated to make early XP along with 98 work well.

momaka wrote on 2024-09-24, 21:00:

Or here's the easier alternative: re-use the old fan with a speed controller. […]
Show full quote

Studiostriver wrote on 2024-09-24, 01:20:

I guess i`ll have to find a repair guy who will somehow find a way to mount a fan without screws, or to order new heatsing on which will be easier to mount new fan. Man i now it would not be easy task. 🙁

Or here's the easier alternative: re-use the old fan with a speed controller.

For the purpose, you can use either this:
https://www.ebay.com/itm/156370695273

Or this:
https://www.ebay.com/itm/365083000194

For the 2nd one above, get the "white" extension resistor cable, as that one has the lowest resistance (27 Ohms). This will slow down the fan the least. However, since this is a 5-piece kit, if one of these extension resistor cables does not slow down the fan enough for you needs, then daisy-chain two of them and you will get pretty close to what the "red" one is offering.
The item from the 2nd link above will also allow you to keep your motherboard RPM monitoring on the CPU fan.

Or if you want to be real fancy, you can use one of these to control up to 8 fans in your system and you get to adjust the sped to your liking:
https://www.ebay.com/itm/296704957066

*EDIT*
Wow, what's happened to just getting a single channel 3-pin fan controller? Seems like those have gone the way of the Dodo bird. Kind of pisses me off your can get all these multi-channel PC fan controllers, but you can't get just a simple series 1-fan controller. Oh, and 1st thing ebay and AliExp. seem to shove my way is silly ARGB controllers.
/rant

Studiostriver wrote on 2024-09-24, 01:20:

If you can recomend me good new PSU that will work well , i think i have no one who will properly mod this PSU , replacing caps etc, i just want to replace fan, but its pretty hard task fo me since i`m not into such a things, i only like to play video games, haha. 😀

Gotcha.
Well, I haven't bought a new PSU in ages. Actually, last and only new PSU I bought was 20 years ago. Everything else since then has been used (and most have been picked with issues on purpose, just to fix them up for fun... but I get that's not what you're digging for.) With that said, I don't know how good my recommendations would be... and anyone here is welcome to comment on that... but here is what I found so far that should work OK for your system:
https://www.evga.com/products/product.aspx?pn=100-N1-0400-L1
https://www.evga.com/products/product.aspx?pn=100-BR-0450-K1
https://www.antec.com/product/power/vp550p-plus
https://www.antec.com/product/power/csk-450-bronze

I haven't looked at Corsair or Thermaltake yet to see what they have to offer... or some of the newer brands that I keep forgetting about. Either way, all of these newer PSUs should be way more quiet than the old one, since they use bigger fans and also have fan controllers.

Hey all those brands are available here where i live for PSUs, thats cool. 😀 As for CPU fan cooler regualting speed it all sounds like super idea. I reconsidering know to get maybe complete passive solution , Andre 6 suggested there are big ulky heatsink models A socket 462/ socket A cooler which seems like a nice idea too.
I will reconsider each solution, and i have plenty of options know.
You are all here are so kind, i appreciated your time to write down these noobie things for me who just started his journey into Pentium III , and i have no clue about most things how function. 😀 Slowly learning curve is going up. 😀
And i already bought new GPU, see from previous comment. 😀 Its in phase of testing right know.

Hey guys, i`ve been surfing a bit and found two heatsinks that would be cool upgrades, and easy to swap fan if need to. My question is would i take more beefier looking heatsink or smaller that reminds to original is enough? I plan to upgrade with Tualatin 1.4 CPU in a future so i`m kind a in wonder what to choose between those 2 i found soothing?
Smaller one looks aesthetically better , but i`m in wonder will it be enough or its better to get bulkier one?