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Problems with differing VRAM

post #1 of 8
Thread Starter 
Hello, recently joined this forum because it seems to have pretty good advice.

I'm having a problem right now with coolbits and differing VRAM on my two GTX 680's. I originally bought an EVGA GTX 680 2GB superclocked + card on launch and played around with that for a while and a friend want to get rid of his GTX 680 4GB FTW+ for $200 so he could upgrade to a 780. I jumped on the chance and, not knowing that the VRAM would cause problems, threw it into my computer. Both cards were recognized, but an SLI connection could not be made. After some digging, I finally learned about coolbits and got it to at least see that connection in the nVidia control panel. The cards are in SLI with dedicated PhysX and everything, but the second card is not being used at all. I've monitored the usage in quite a few games and only the first card seems to be getting used. I even switched the slots of the cards and it always fails to utilize the second GPU.

My question is, is there anything I can do to fix this or what may be causing the problem? I can provide any information needed if someone may have an answer. redface.gif
post #2 of 8
if it's not showing up AT ALL in Device Manager, that means there's something wrong with the slot...
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post #3 of 8
Thread Starter 
It's recognized in the device manager and I can even go into the nvidia control panel and set up SLI, it just doesn't use the second card.
post #4 of 8
SLI is not working because of enabling dedicated physx
yunojelly
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post #5 of 8
your sure you enabled SLI in nvidia controll panel?

check GPU-Z to see if its there.
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post #6 of 8
Thread Starter 
I unselected the dedicated PhysX and it worked with syncing the SLI but it caused an error. After I restarted my computer my resolution went to 800x600 and nvidia control panel would not open. It told my that I didn't have an nvidia device in a PCI slot and when I checked the device manager it said that Windows had disabled the device because an error occured.
post #7 of 8
Sorry for such a late reply, you found a fix for it yet?

If not, here is a little checklist that might help.

1) Make sure the card would function as normally by itself. (run some benches with just it plugged in)
2) Make sure the driver isn't the issue... Sadly, that last WHQL driver that works for me is 306.97, results will probably vary.
3) make sure you have "Coolbits64" as a 64 bit Qword value set at 18.

More than likely it is #2, hope you are still following after 2 weeks, or have solved your problem.
post #8 of 8
I'm having an issue with Coolbits atm as well, but mine is because coolbits isn't correctly forcing the VRAM to 1.5, so the comp. will completely crash when it gets to the threshold. Not during SLI tho, just when I enable surround. Meh, unless anyone has advise, guess I will just wait till I can upgrade to a 780 to use surround.
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