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HD7950 revised with reference HD7970 PCB club - Page 28

post #271 of 692
1/17/13 at 1:50am
Quote:
Originally Posted by glina View Post

You are probably getting a better overclock with the 7970 BIOS as it bumps up the voltage. What voltages (core and mem) are you getting with it?
Can you please dump the BIOS and upload it? I'd be curious to try it.

What is the best clock you can get with the 7950 X0A bios and what is the reported voltage?

My VRM's with the X0A bios and 1100/1800 overclock peak at 104-108C in prolonged Furmark stress. That is at 0.98V (1.06 before vdroop) core and 1.5V memory. In games, VRM's peak at around 80C (core <70C).

BTW, with Vmem @ 1.625V my memory can clock up to 2000-2050MHz and is stable enough to run benchmarks without artifacts, but will crash as soon as the temperature rises. I didn't notice a dramatic increase in VRM temperatures with increased Vmem.

Sounds like you have got a great clocker there. Whats the Part Number of your card?

http://www.techpowerup.com/vgabios/117406/Sapphire.HD7970.3072.120207.html
thats the bios I am currently using, stable overclock but hot VRMs.

I'll give the X0A bios another go with the settings you use but during my last experiments with it I got crashes with even a mild memory overclock.

I think when the new catalyst drivers are out I'll do a complete wipe, bios flash and try again with that bios.
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post #272 of 692
1/17/13 at 4:34am
Hello everyone, heres another owner of a HD7950 with 7970 PCB (MSI TFIII).

Seems like my card is pretty much inline with the others, moderately high Vdroop (1,075V set in AB, gpu-z shows 1,03V something), doesnt like voltage at all (or the cooler doesnt, VRMs stay quite cool even at 1,17V) and it overclocks decently, managed to get 1150mhz core @ 1,1V and could run 3dmark11 easily with 1200mhz core @ 1,13V. Memory seemed stable at 1700mhz without touching the voltage, didnt try any higher.

Pretty happy with the card itself, its just the cooler that is unable to keep up, @ 1,1V with 69% fanspeed temps start getting close to 75c in demanding games, not sure if its too high or not. Or is it just that these high ASIC % cards start getting hotter on lower volts than those with lower ASIC? Mine has ASIC of 88,9%.
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post #273 of 692
1/17/13 at 12:47pm
Hello, heres an owner of a VTX3D HD 7950 X-Edition V2 biggrin.gif Seems like this is on a reference 7970 PCB (maybe)? 8+6 pin power connector, VRM has its own heatsinks unlike on the reference 7950 PCB. But i'm quite surprised that this uses Elpida's IC's (Rated at 1250 Mhz, 5Ghz QDR.) EDW2032BBBG 50-F. Is this a somekind of hybrid or what? I'm just a little bit unsure tongue.gif
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post #274 of 692
1/17/13 at 4:17pm
Thread Starter 
Quote:
Originally Posted by Coree View Post

Hello, heres an owner of a VTX3D HD 7950 X-Edition V2 biggrin.gif Seems like this is on a reference 7970 PCB (maybe)? 8+6 pin power connector, VRM has its own heatsinks unlike on the reference 7950 PCB. But i'm quite surprised that this uses Elpida's IC's (Rated at 1250 Mhz, 5Ghz QDR.) EDW2032BBBG 50-F. Is this a somekind of hybrid or what? I'm just a little bit unsure tongue.gif




photos of pcb

?
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post #275 of 692
1/17/13 at 4:23pm
What load voltages do you guys get at 1.3v set?
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post #276 of 692
1/18/13 at 5:15am
Quote:
Originally Posted by SonDa5 View Post

photos of pcb

?


Here you go! Image quality is not the best, took it with my phone.
I'm stable at 1100/1405 at 1,1V. (Stock 1.031) The VRM's temps are high though when Oc'D, VRM1 hits up to 106C at load while playing long sessions of BF3. Should i put some MX-4 atop of the vrms, if that helps?
Edited by Coree - 1/18/13 at 5:17am
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post #277 of 692
1/18/13 at 7:55am
So the question I have is which 7950 should I buy?
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post #278 of 692
1/18/13 at 7:58am
HIS HD 7950 IceQx if you want a good quiet blower-type fan.
Sapphire HD7950 Dual-X.
There are many more, but these are my favourites biggrin.gif
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post #279 of 692
1/18/13 at 1:38pm
Quote:
Originally Posted by cane316 View Post

I'm currently using a 7970 bios on my Sapphire Vapor-x 7950.
It didn't unlock any extra cores or anything like that but has been the most stable of the few I've tried.

VRM temps are still a problem for me though. In BF3 with memory clocked higher than say 1400 they start to rise up to around 110 degrees and I start getting artifacting in game (gun models stretching off into weird black shapes). I treid the bios that Sapphire put out on facebook (V0A??) but couldnt seem to get a good stable overclock with those and the MVDCC voltage was 1.5 at default, I'm guessing to keep the VRM temps down.

Are toasty VRMs a good enough reason to return a card? Had it a couple of months now and it seems the only thing holding this card back from higher overclocks as it has the hynix memory and core overclocks well.

If your VRM temps get high enough to start artifacting at STOCK clocks and volts of a 7950, then that absolutely warrants a replacement. That's a defective card. But if you don't get artifacts at stock clocks and volts, they'll just send the card back to you. See if OCCT finds any errors at stock clocks/volts, if it does, tell the manufacturer to test your card with OCCT to prove it's defective, and you'll get a new one. Just make sure you flash your bios back to the original bios before sending it in, because flashing the bios fully voids your warranty. Hopefully you saved your original bios somewhere.


So I know it's possible to run a 7950 with a 7970 bios. But I believe if both cards are at identical clocks, the 7970 will be a little bit faster because it is using more stream processors (or shaders) and more texture units. So, can anyone confirm that a 7950 (with a 7970 PCB) that has a 7970 bios actually shows 2048 stream processors in GPU-Z?
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post #280 of 692
1/18/13 at 3:16pm
Thread Starter 
Quote:
Originally Posted by Coree View Post


Here you go! Image quality is not the best, took it with my phone.
I'm stable at 1100/1405 at 1,1V. (Stock 1.031) The VRM's temps are high though when Oc'D, VRM1 hits up to 106C at load while playing long sessions of BF3. Should i put some MX-4 atop of the vrms, if that helps?


vrm 1 doesnt have heat sink. Needs a heat sink with thermal pad not thermal paste. Looks like reference hd 7970 pcb but not sure if compatible with hd 7970 water blocks. compare to my photo.
Edited by SonDa5 - 1/19/13 at 6:09pm
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