Basically if you pit two identical machines against each other in a game or synth benchmark, one running the graphics card in x16 configuration and the other in x8 configuration, the x16 configuration will (obviously) perform better, but only by about 4% over the x8 configuration machine.psivamp said:Yeah, I don't know how much or how little that bandwidth cut matters. I would assume that it wouldn't have mattered much (which is basically what you said, if I understand you properly). I haven't built an SLI machine and probably never will. And, looking back, I think I've only built one tower since PCI-E came out. Fucking technology.Griffolion said:-snip-
So in a sense, bandwidth doesn't matter when you're looking at anything up to dual GPU configs.
When looking at motherboards, you have to avoid ones that have two PCI-E x16 2.0 specification slots, but one of them is actually a x4 slot in disguise. You could still CF or SLI with that, but a x4 slot majorly cripples a card's peformance to the point where you may as well just stick with a single GPU setup in the full fat x16 slot.