I bought a bunch of components about 3 weeks ago, but I have had to replace the motherboard (I was sent a a discontinued model that didn't support the RAM timings). I just put in a EVGA P55 Micro (just found out that it is EOL), but everything now works - except SLI.
i7 870 at stock speed
4GB DDR3 1600 G.Skill Ripjaw
EVGA P55 Micro socket 1156
2x MSI GTX 460 1GB Cyclone
Seasonic X Series 750W Gold
Let me backtrack a bit...
I had a P55V, but it wouldn't run the RAM at the rated timings, but it would run SLI. The place I bought it from could not guarantee that I would receive the correct version so I had to buy a completely different model. Just the other day, I installed a P55 Micro and it finally allowed me to run the correct timings. But not SLI...
Here's the problem:
Whenever I try to use the Nvidia control panel to "Maximize 3D performance," the computer will show the loading bar, the screen will flicker while it begins to use both GPUs, and then freeze. Sometimes I can move the mouse for a second or two before it freezes, but none the less freezes.
I thought it may have been a video card malfunction, so I switched their placement and tried it again. Then I tried switching the SLI bridge around. still nothing.
Uninstalling and reinstalling new drivers does not help either
Games run fine on one GPU, but given that I was able to run SLI before, I'm wondering if it is a faulty electrical slot on the motherboard...
It might be the motherboard. Try swapping the GPU placements (and only running one card at a time) to see if anything weird happens. The one card at a time would be the next time instead of just swapping and trying.
You mentioned some RAM stability problems as well... Can you run a memtest on that, just in case?
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Finally got it to work.
I had to uninstall all the drivers in Safe Mode, then install the EVGA ethernet driver and Nvidia drivers. Flashed the lastest bios. Then had to reboot several times. Finally had to disable Nvidia HD audio in the appropriate bus -es to ensure that there wasn't a conflict. Finally got it to work and made sure checking I had everything correct. Ugh, the bios update was the worst, I still need to set my RAM timings...