Increase IOH and ICH voltage. I need 1.2v IOH and 1.16v ICH for my SLI setup.
I find pci-e freq does nothing for me unless I'm above 205bclk.
Also, you may need to increase QPI.
i've increased ioh to 1.24 and ich 1.20, and it seems to work much better, 985mhz with the two cards....that's ok for now, but the cpu is horribly unstable .... bsod very often while running 3dmark vantage ....
Bookmarks