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EVGA 770 Voltage issues

post #1 of 7
Thread Starter 
I posted this issue already on linustechtips and they said go ask you guys so here is a link if you want to read what has already been discussed http://linustechtips.com/main/topic/480867-770-vddc-stuck-at-119v/#entry6455962.

I have two EVGA SC 2GB 770s running in SLI. One is the original 770 I bought a year ago and the other is a two month old B-Stock one. The B-Stock one has the BIOS version 80.04.C3.00.72 while the first 770 I owned has the version 80.04.C3.00.70, so I will refer to them as the 72 and the 70 card since that is my best way of differentiating the two apart.

https://i.gyazo.com/614533a6937b39b539a52f2000491dc5.png

This is what the issue is. As you can see the card on the right (which is the 72 card) is running at 1.19V while the other is running at the correct stock voltage of 1.2V. Now I do have Afterburner softmodded to allow up to 1.3V and that IS supposed to be working in that screenshot, however I want to focus on getting both cards running at the stock voltage first before figuring out why neither will run above the stock voltage.

After some more testing I disabled SLI and ran only the 70 card (since it is on top and the monitors are plugged into it). With SLI on the 72 card ran at 1.19V and the 70 ran at 1.2V, however, when I turned SLI off the 70 card began running at 1.19V!

When I enable SLI for some reason the 72 card (which is in the second 16x slot) is set as GPU 1 and the 70 card as GPU 2. MSI Afterburner shows the 72 card as GPU 1 and GPU-Z has the 72 card as the first in the dropdown. However, the Nvidia Control Panel reports correctly that the 70 card is GPU 1 and even shows the diagram of where the displays are plugged in at. For some reason MSI Afterburner and GPU-Z think the cards are in different orders than they are. My hypothesis is for SOME reason SOMETHING is making GPU1 run at 1.19V while GPU2 is allowed to use 1.2V. This would explain why with SLI on and 72 being reported as GPU 1 it is only using 1.19V but with SLI off and 70 now set back as GPU 1 it then gets 1.19V.

I have cleaned and reinstalled my video drivers so that isn't an issue. Does anyone have any ideas about what I should try next? (And yes I know 1.19V is .01 lower than 1.2V and isn't a big deal, however I am trying to get both cards to run ABOVE 1.2V with the afterburner softmod and I can't even get both at 1.2V)
Edited by Keudn - 11/8/15 at 8:42am
post #2 of 7
Did you flash the cards to the same BIOS?
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post #3 of 7

the dev ID's are likely related to the order you originally installed the GPU into your system

 

 I would go to reg edit and remove; all GPU listed and then reinstall

 

 

**Also - using GPU-Z to check your ASIC on both GPU .. you should see why one card needs less power, it likely has much higher ASIC Q vs. the other. So long as both cards run the same clocks, the voltage required is of no concern really.

post #4 of 7
Thread Starter 
Quote:
Originally Posted by white owl View Post

Did you flash the cards to the same BIOS?
No I didn't, would a different BIOS version make any difference though?

Quote:
Originally Posted by CL3P20 View Post

the dev ID's are likely related to the order you originally installed the GPU into your system

 I would go to reg edit and remove; all GPU listed and then reinstall


**Also - using GPU-Z to check your ASIC on both GPU .. you should see why one card needs less power, it likely has much higher ASIC Q vs. the other. So long as both cards run the same clocks, the voltage required is of no concern really.
I originally installed the 70 GPU since it was my first GPU in the system. If that was the case it would be the GPU 1 all the time which it isn't according to GPU-Z and Afterburner. I will remove the GPUs listed and see if that fixes anything.

For the ASIC, that is true however that still doesn't solve the problem of not being able to apply more than 1.2V. I DID have the 70 GPU overvolted before with the afterburner softmod but when I got the second I set them both back to stock so I could run them in SLI without any issues coming up. Also if it was a matter of ASIC quality wouldn't it be the same GPU running at a lower voltage, not either of them depending on SLI being on or off?

Edit: The 72 card (the new B-Stock one) has an ASIC score of 80.3% and the 70 card (my first and older one) has an ASIC quality of 77.8%
Edited by Keudn - 11/8/15 at 9:35am
post #5 of 7

So long as both cards have the same memory IC.. the BIOS should be compatible. I own one 770 with Hynix and one with Samsung.. they run fine together in SLI though.

 

*Definitely sounds odd considering the info provided. Editing the BIOS may fix power and clocks, unsure about what may be causing the 'rolling GPU designation'

post #6 of 7
Thread Starter 
Quote:
Originally Posted by CL3P20 View Post

So long as both cards have the same memory IC.. the BIOS should be compatible. I own one 770 with Hynix and one with Samsung.. they run fine together in SLI though.

*Definitely sounds odd considering the info provided. Editing the BIOS may fix power and clocks, unsure about what may be causing the 'rolling GPU designation'
Hm well I will completely uninstall afterburner, gpu-z, and the drivers and see if that fixes anything. I just don't understand why Nvidia Control Panel would report the GPUs correctly when SLIed and Afterburner and GPU-Z have them backwards.
post #7 of 7
Thread Starter 
I completely reinstalled AB, GPUZ and the drivers and didn't fix anything. However I did the math and I have a 850W PSU, with my CPU overclocked to 4.8GHz it is getting close to using 850W. I don't know if this is the problem since when I disable SLI and have one card idling the other still runs at 1.19V anyways. However I do know that I probably won't be able to give the 770s any more than 1.2V since my PSU doesn't have a high enough wattage. I may just live with it how it is until I can get a larger PSU
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