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SLI = unstable overclock - Page 2

post #11 of 16
Some fan(s) blowing cold air onto the video cards will surely do well
From that pix it seems you are taking air from the bottom of the case (?) and blowing it upwords. In that case, a second card looks like it will disrupt it. But before making changes to the fan arrangements you can do the test I mentioned with a room fan blowing into the open case while you prime 95 with the sli configuration. See what happens.


On my case I have a small fan pulling air from beneath the optical unit from outside the case and blowing it twords the cpu, and a case fan blowing cold air from the outside directly over the fan intake of the video card. Seems to work fine.
post #12 of 16
any chance that you have MSI afterburn installed and unoffical overlocking enabled in afterburner settings?
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post #13 of 16
could the stability be caused by the heat from the added video cards hitting the VRMs?

i know i had some issues with that a while back.
post #14 of 16
Ouch. Tough one. But just the same, it was probably a good idea to get a quality PSU with a little more leeway anyway. thumb.gif It'll probably run at higher efficiency and cooler too.

Could be something with the regulators on the motherboard itself and changes in resistance and load on it, or as others have mention, the added heat from the extra video card.
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post #15 of 16
No offense to anyone that made the suggestion to swap the PSU. But SLI would be little to no load on the PSU while running prime. Not 100% sure with SLI, but my 7950's in X-Fire the second GPU is pretty much off (fans turn off) while idle.

I would be very surprised if it is a heat problem to. How long into Prime do these errors start?

Have you tried the new Video Card solo? If you have and verified there are no issues with either card in a single setup. The only other thing I can think of, would be your motherboard. As in it is not regulating the power properly. When running prime, have CPU-Z open and monitor the voltage. Look for large jumps that don't occur when you have the single card in.
post #16 of 16
Thread Starter 
Im back wink.gif

I still have not found the problem.

I have tested to put the reference card on top pci-e and the non-reference on bottom pci-e slot. Driven Prime95 max temp of cpu 63c (on hottest core)
But get the same error each time after some hours.
But it's really not as bad as I have not had any big problems with the stability of the game, etc.

The 2 gtx 560 ti 448 core, I've never overclocked these in SLI, but I'm hungry as hell to overclock them. biggrin.gif
I know my first gtx 560 ti 44 core (gigabytes non-reference) overclock very nicely. 890mhz core with only a slightly higher voltage.
So it feels pretty damn running in stock speed 732 mhz.

But I have not dared to overclock them, becose this problem of the CPU becomes unstable with SLI.

But what do you guys think should I overclock them anyway? biggrin.gif
Edited by robalm - 5/18/13 at 4:31pm
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