[quote]Doubling the performance looks like a pretty big difference to me. Sure it doesn't double performance at every rez, but this is HUGE for multi-gpu machines. Not slightly.
http://www.guru3d.com/article/core-i7-multigpu-sli-crossfire-game-performance-review/7
But look at the drop off as it approaches 2560 res. Once you get to 5040 res the gain will be negligible. I doubt you'd see any real advantage at 5040 on my system if I swapped to a 920 or even a 965. I certainly aren't going to pay a few thousand dollars (mobo, CPU and watercooling) for the privilege of a few FPS!
Using 280 SLI @ 2560:
BIAHH: +50%..very good
CoD4: +2% ..very poor
Far Cry 2: +5% ..very poor
FEAR: -3% ..arrgh!
Crysis WH: +8% poor
So not that good, accept at BIAHH, and the shape of the graph shows the difference rapidly shrinking as resolution increases. So at the res I want to play (an extra 1.3MP over 2560- almost 1/3 more) I will see virtually no gain, or none at all.
Well sure, I didn't say it was better all the time, I said at certain resolutions in my second post. Obviously the resolution you're running at isn't going to see a bump at all. But for the majority of people out there with one monitor, they will see big jumps. And thank you for being mature about this, Mach1.9pants, as apposed to others in here.