[citation][nom]ubercake[/nom]How else can you determine the performance from a practical standpoint? FPS. Whether the rest of the equipment is capable or not. Three 1080p 120Hz monitors would not require vsync.I've found my 120Hz monitor provides a far better gaming experience than any 60Hz monitor. There's a smoothness and responsiveness to it that you really realize when you take a quick trip back to the 60Hz world. I tried an IPS monitor at 2560x1440 (6.5ms response) last night to see for myself what the extra pixels could get me and to compare the difference when gaming with more pixels versus a faster refresh rate. While the extra real estate was nice, the tearing is just nasty (running 2x680s). It required vsync and we all know what that does to performance. I won't run with vsync, so I'll be returning the IPS today. I don't think I can ever go back to 60Hz monitors for gaming. As a result, FPS beyond the "ideal" 60fps/60Hz matchup is important to someone like me. There's really no way to describe the difference in performance/perception other than you'd have to try it to understand what I'm saying. At any rate, my goal is to get my games to perform at 120 fps or higher.[/citation]
I actually have 3xHD (5900x1080/bezel correction)
specifically 3xAcer GD235HZbid with 3-WAY EVGA GTX 680 4GB (04G-P4-2686-KR) + EK and the whole purpose is 3D Vision which takes the 120Hz and divides it into two (2) 60Hz 'channels' per eye (lens) and otherwise whether I'm running 45~50+ min FPS there's absolutely no discernible differences other than your 'perception' of what you believe it to be.
Now the reason I went with 4GB GTX 680's is to avoid vRAM bottlenecks with 3xHD, next in most games you still can drive down the FPS with over the top AA/quality. Further, most games often cut in half your 2D FPS rendering running in 3D.
The best I can say 60Hz vs 120Hz is some reduction in motion blur** that frankly I cannot see but rather sense. So is this a belief or reality?!
** Another consideration is quality of the panel, TN/TFT vs IPS and specifically TN/TFT (120Hz) vs IPS (60Hz~75Hz) most 120Hz use TFT panels which are not as good as the superior IPS panels. So high refresh rate with blurry images vs crisp and clear 60Hz~75Hz on IPS LCD displays? My home monitor uses an IPS, my daughter's gaming rig is the 3D/TFT. Decent IPS panels like Dell UltraSharp are a good choice to consider.
My point is there's more to it and 60Hz vs 120Hz isn't doing to do much if anything for most. If your rendering exceeds your monitor's refresh rate (60Hz or 120Hz) my best advice is to
use vSync and avoid the ripping/tearing that I almost guarantee in any game.
Tearing looks like this; Disabled vSync: