Ausschnitt aus dem Fazit, das aussagt, dass Quad-SLi auf nem i7 System in den meisten Spielen ganz gut läuft und es auch keine größeren Treiberprobleme wie Abstürze gab:
Comparing to Quad GPU testing, say two years ago, I'm just going to say that I was surprised how few 'serious' driver issues we actually had. Sure, there were some scaling issues and oddities here and there, but the GTX 295, for example worked like a charm in most titles. So overall the experience was pretty reliable, and well ... you'd almost take the high framerates for granted, like it's a normal thing to have Far Cry 2 at 2560x1600 (DX10/4xAA) running an average of 100 frames per second.
With the game titles tested, we really didn't run into any bad atypical issues like crashes or anything. At most we noticed some scaling issues or a game that kicked back towards 2 GPUs. NVIDIA's cards work instantly with Quad SLI, there was no need to alter profiles. Props to NVIDIA for that as that really was an impressive experience for what is a very complex set of hardware. CrossfireX also was an extremely pleasant experience, though on a couple of occasions the X2 would not kick into CrossfireX (4 GPU) mode. But where it worked, it was phenomenal as well. So yeah, this was an awesome experience.
Should you for whatever reason be drooling over and opting for Quad GPU gaming, you should make sure you are on the Core i7 platform. It really makes a difference. The Core i7 processor and X58 combo rocks hard and seems to be a truly excellent match to today's multi-GPU based setups. But allow me to make it very clear though, a setup like tested today does not make any sense money wise or power consumption wise and neither will I try to defend that. Please weigh out the overall costs and disadvantages carefully before investing. But, I'll be damned if I try to deny it ... it's a heck of a lot of fun.