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.
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