Seem's that a normal Nvidia FX5200 can use DDR2 VRAM without an issue. Still working on the memory layout , the ic's that i put are 16X16 (256Mb) but the card uses them in a 8X16 (128Mb) config.
That's actually really interesting. It seems the Asus 7600GS uses 400MHz TSOP GDDR2 - is 275MHz all you could squeeze out of the memory chips on the 5200 PCB? What about memory timings? The GDDR2 chips should in theory use higher timings - what about to increasing memory timings as well, then have a go at raising the clocks? What about voltage? Wouldn't the GDDR2 chips run at lower voltage, or do they run at a similar voltage due to the higher clocks? (then again 400MHz isn't really that high for DDR2). What did you use the salvaged caps and resistors for?
I have a dead 6600 that makes used of TSOP DDR2 memory, I'd like to give this mod a shot as well.
Socket3 wrote on 2023-02-14, 20:51:That's actually really interesting. It seems the Asus 7600GS uses 400MHz TSOP GDDR2 - is 275MHz all you could squeeze out of the memory chips on the 5200 PCB? What about memory timings? The GDDR2 chips should in theory use higher timings - what about to increasing memory timings as well, then have a go at raising the clocks? What about voltage? Wouldn't the GDDR2 chips run at lower voltage, or do they run at a similar voltage due to the higher clocks? (then again 400MHz isn't really that high for DDR2). What did you use the salvaged caps and resistors for?
I have a dead 6600 that makes used of TSOP DDR2 memory, I'd like to give this mod a shot as well.
Im guessing the issue is that some of the bootstrap timings for memory are hardware based on the PCB, I know many later nVidia GPUs had physical hardware that lets the card know what basic memory timings it should be using. If the memory timings were simply Vbios based then changing them shouldn't be an issue with a bit of digging.
The Asus card had HY5DU561622ETP-4 ic's, they are gddr2 500 Mhz(250mhz effective), divide that by 2 (same as the speed of the ddr2 ram in CPU-Z is divided) and you get the actual frequency. What you see in the GPU-Z memory speed tab has to be multiplied by 2 to get the 'commercial speed', so i got some extra 50Mhz(25mhz real).
It has some small volt mods: the stock mem ic's were dual voltage gddr chips (3,3v and and 2,5v) so i moved around some resistors to get only 2,5v (that's what HY5DU561622ETP-4 like). Then i had to mod the voltage regulator because i was getting 2,41v (2,45v) so got it to 2,58v for the memory and for the gpu die from 1,38V (1,4v ) to 1,56V. All had to be done at a hardware level, it can't be controlled via vbios.
bogdanpaulb wrote on 2023-02-15, 02:16:The Asus card had HY5DU561622ETP-4 ic's, they are gddr2 500 Mhz(250mhz effective), divide that by 2 (same as the speed of the ddr2 ram in CPU-Z is divided) and you get the actual frequency. What you see in the GPU-Z memory speed tab has to be multiplied by 2 to get the 'commercial speed', so i got some extra 50Mhz(25mhz real).
I'm going by the specs posted here: https://www.ozone3d.net/gpu/asus_7600gs_agp.php - the table sais 800MHz memory speed which comes to 400mhz effective like I said in my first post. Must be a different version of the 7600gs with faster ram.
bogdanpaulb wrote on 2023-02-15, 02:16:It has some small volt mods: the stock mem ic's were dual voltage gddr chips (3,3v and and 2,5v) so i moved around some resistors to get only 2,5v (that's what HY5DU561622ETP-4 like). Then i had to mod the voltage regulator because i was getting 2,41v (2,45v) so got it to 2,58v for the memory and for the gpu die from 1,38V (1,4v ) to 1,56V. All had to be done at a hardware level, it can't be controlled via vbios.
A detailed guide with some pictures would be greatly appreciated.
Nice mod!
Although as far as I know, there is no DDR2 or GDDR2 chips in TSOP package. They are in BGA package only. So you replaced the original slow DDR chips with faster ones, but still DDR (1).
HW museum.cz - my collection of PC hardware
Socket3 wrote on 2023-02-15, 04:39:I'm going by the specs posted here: https://www.ozone3d.net/gpu/asus_7600gs_agp.php - the table sais 800MHz memory speed which c […]
bogdanpaulb wrote on 2023-02-15, 02:16:The Asus card had HY5DU561622ETP-4 ic's, they are gddr2 500 Mhz(250mhz effective), divide that by 2 (same as the speed of the ddr2 ram in CPU-Z is divided) and you get the actual frequency. What you see in the GPU-Z memory speed tab has to be multiplied by 2 to get the 'commercial speed', so i got some extra 50Mhz(25mhz real).
I'm going by the specs posted here: https://www.ozone3d.net/gpu/asus_7600gs_agp.php - the table sais 800MHz memory speed which comes to 400mhz effective like I said in my first post. Must be a different version of the 7600gs with faster ram.
bogdanpaulb wrote on 2023-02-15, 02:16:It has some small volt mods: the stock mem ic's were dual voltage gddr chips (3,3v and and 2,5v) so i moved around some resistors to get only 2,5v (that's what HY5DU561622ETP-4 like). Then i had to mod the voltage regulator because i was getting 2,41v (2,45v) so got it to 2,58v for the memory and for the gpu die from 1,38V (1,4v ) to 1,56V. All had to be done at a hardware level, it can't be controlled via vbios.
A detailed guide with some pictures would be greatly appreciated.
Well that Asus card was untouched on the mem ic's and here the same card with similar ic's( HYB25D256163CE-4.0): https://www.hartware.de/2006/07/26/geforce-76 … s-agp-von-asus/ - (last pic is with the mem ic's)
I will make a small tutorial with the volt mod's.
havli wrote on 2023-02-15, 11:07:Nice mod!
Although as far as I know, there is no DDR2 or GDDR2 chips in TSOP package. They are in BGA package only. So you replaced the original slow DDR chips with faster ones, but still DDR (1).
If that is true, then somebody lied when they marketed their product 😀 .
The formula for the voltages in both cases is: V = 0.8*(1+Rx/Ry).
thanks for the pics, much appreciated!
If you need anything else, let me know.
