What I have found with my setup is when running 1 GTX 470, no problems with flickering. When running with 2 in SLI, the flickering is terrible & constant. But when I run with 3 470's in SLI, everything in game runs good again. I have tested 2 way SLI in different express slots (8x, 16x, & a combination of both) with the same bad flickering results. Single & 3way both work equally as well, but not 2way for some reason. Strange?
EVGA X58 Classified3 E770 EATX Mobo
Intel Core I7-950 3.06 GHz 1366 Quad OC'd @ 4.1 w/turbo
Zalman CNPS9900Max-B 135mm CPU Cooler
EVGA GTX470 SC. x3 in SLI OC'd @ Core:680, Shader:1360, & Memory:1770
EVGA GT430 dedicated for Physx
Corsair XMS3 3x2GB DDR3 1600 Triple Channel
WD Caviar Blk 500 GB 7200rpm x2 in Raid0
Coolermaster Silent ProM 1000 Watt
Coolermaster HAF X Case
Very strange and random this bug is
I have 3 Cards and get flicker, 2 cards flicker, unless I disable my PhysX card, then there's still some flicker, but much less.
Basically seems totally random.