It may be difficult to invoke appreciation about this particular motherboard from others who played with it, but you certainly achieved very interesting results with it.
Its handling of L2 cache is on the same level of weird as the M919 issues you mentioned, but apparently you were able to work it out nicely.
Documented some of my struggles here with more details in the following replies in the same thread, for reference.
Nice hint about setmul for enabling the L2 cache. Didn't think of that. Will try it soon. Maybe that's the silver bullet.

Why 512Kb of L2 cache only ?
You can squeeze few more bits of perf with 1024Kb buffer.

Your Quake 1 score is very good.
Doom and PC Player are up there too.

Thanks for sharing.

(btw, this board has the chops for 200MHz (4x50), but not fully stable)

Very nice Tyrhus!

If you get a chance, can you try running nocash's MP3 encoder benchmark and report back? Mp3 decoder

Tiido and I got wildly different results on our higher end 486s.

pshipkov wrote on 2024-10-13, 17:28:

It may be difficult to invoke appreciation about this particular motherboard from others who played with it, but you certainly a […]
Show full quote

It may be difficult to invoke appreciation about this particular motherboard from others who played with it, but you certainly achieved very interesting results with it.
Its handling of L2 cache is on the same level of weird as the M919 issues you mentioned, but apparently you were able to work it out nicely.
Documented some of my struggles here with more details in the following replies in the same thread, for reference.
Nice hint about setmul for enabling the L2 cache. Didn't think of that. Will try it soon. Maybe that's the silver bullet.

Why 512Kb of L2 cache only ?
You can squeeze few more bits of perf with 1024Kb buffer.

Your Quake 1 score is very good.
Doom and PC Player are up there too.

Thanks for sharing.

(btw, this board has the chops for 200MHz (4x50), but not fully stable)

The post you linked is a really interesting read with loads of infos.

Reading it I think I may have a solution for your struggle with L2 cache.

While tinkering with my board I tried all 4 different bios I could find online. And the later ones were crippling the performance or just plain bugged the thing.

The original 7/21/95 is the best and fastest.
One of the later ones available online (the 1/1/96 I think) gave me the same false L2 cache reading during boot, reporting only 256kb while the older bios worked fine.

I would suggest rolling back to this 7/21/95 bios if you never tried.
Some bios are made for the amptron version and it seems it's not suitable for the PC Chips varient

My board is a 1.2a and yours a 1.2 so maybe it won't work with yours who knows?

I can also agree that this MB is just acting weird sometimes:
I got it with a 120mhz AMD DX 4 that was in fact a 586 in disguise. It has 16kb of WB cache and can be run at 133mhz , being detected as a 586 X5, but refused to boot at 160mhz.
With this cpu I could run SRAM at 2-1-1-1 when using a single bank of 256kb and 3-1-1-1 when using 512kb.
With the am5x86 X5, I can run SRAM at 2-1-1-1 with the same 512kb dual bank.
Weird...

I always thought 512kb was enough, but now that you say it, I wanna try with 1mb of cache!

Many Bothans wrote on 2024-10-13, 18:55:

Very nice Tyrhus!

If you get a chance, can you try running nocash's MP3 encoder benchmark and report back? Mp3 decoder

Tiido and I got wildly different results on our higher end 486s.

Thanks this machine was a real pleasure to assemble and tune and I'm pretty satisfied with the result!

Give me a few days to wrap my head around what HXdos is and how can I run this tool in my dos only PC and I will get back to you!

And does turbo function work with that amd?
To what performance levels can you turbo it?
Do you have “suspend / green break” vs “turbo” choice in that AMI WinBIOS?

Bruno128 wrote on 2024-10-15, 17:39:

And does turbo function work with that amd?
To what performance levels can you turbo it?
Do you have “suspend / green break” vs “turbo” choice in that AMI WinBIOS?

The turbo function dimish the Norton sysinfo score by 0.5 points.
I don't know the exact reason but the WB CPU doesn't work with turbo function.
If I remember correctly, the Intel dw4 WT seems to work with turbo.
But you can always disable l1 cache.

There is a power saving menu in the bios but not sure about the suspens/green break option. I will check tomorrow.

I have an AMD 5x86 running at 160mhz too.
It Still can’t play MP3’s or Most Video’s.
So what is the point ?
You Need a Pentium class computer for this.

The 5x86 barely runs Win95.

I prefer thinking that this shitposter is a bot rather than insane person

Intel486dx33 wrote on 2024-10-20, 16:18:

I have an AMD 5x86 running at 160mhz too. It Still can’t play MP3’s or Most Video’s. So what is the point ? You Need a Pentium c […]
Show full quote

I have an AMD 5x86 running at 160mhz too.
It Still can’t play MP3’s or Most Video’s.
So what is the point ?
You Need a Pentium class computer for this.

The 5x86 barely runs Win95.

I have a cyrix 5x86 running at 120mhz, before i have a amd 5x86 at 160mhz, and never have any problem to play mp3 files, even at 320kbp. In win31 i can play 64kb stereo mp3 in background while doing some work without problem, for example excel work or programming in visual basic 3

Win95 or NT4 works fine, i use NT4 for basiegaxorz programming in 486 and is fine too

Tyrhus wrote on 2024-10-18, 21:27:

There is a power saving menu in the bios but not sure about the suspens/green break option. I will check tomorrow.

I meant the one like pictured here:
Re: Turbo button on 486 acts like a 'sleep' button

Bruno128 wrote on 2024-10-24, 19:28:

Tyrhus wrote on 2024-10-18, 21:27:

There is a power saving menu in the bios but not sure about the suspens/green break option. I will check tomorrow.

I meant the one like pictured here:
Re: Turbo button on 486 acts like a 'sleep' button

Oh I will look for that tonight! I never explored the menu. What would be the use of that ?

Some updates with my build.
I tried to make my Cyrix 5X86 Work with its hidden parameters but the scores are really low. I need to try again but the scores were really disappointing... The AMD is far simpler and is a real power house at 160mhz!

I also finally got my hand on POD 83mhz!
This cpu is really cool and i have great scores with it and it's really close to my socket 5 + p100 experiment.
Unfortunately i didn't have enough luck to score a CPU that can run at 100mhz out of the box. At 100mhz this setup would be really close to a "real" pentium setup.

I'm getting Divide Overflow errors left and right when overclocked . Does someone know what does it means ?

Here are my results with the pod at stock speed:

Speedsys 61.56 (204.40) 163.15/49.07/43.08
Doom 51.2
Quake 22.6
3d Bench 86.3
Pc Player 23.8
Sys info 264.7

I'm really tempted to do the diode mode to run it at 100mhz, but I don't want to ruin such a collector pièce!