Sorry about the somewhat brutal thread resurrection, I figured it was better than creating a new one.
I've just installed the game, but I think my trusty old Core 2 Duo E8400 (3.00GHz) might be struggling. I get somewhere around 30~35 FPS with an HD 6950 in 1080p, and lowering the settings doesn't seem to have a very substantial effect. Going to 5760×1080 only lowers the framerate to about 20~25 FPS, which is below my personal playability threshold, but not that much of a drop for tripling the number of pixels that have to be rendered. Also, enabling MSAA 4X only seems to lower the framerate by 2~3 FPS or so.
So I'm thinking the game is probably quite CPU-limited, but I couldn't find any benchmarks online, only a few posts from people saying the game is indeed quite CPU-dependent, some going as far as calling it similar to GTA IV in this regard.
I was just wondering if some B3Ders could confirm this. No need to go through the trouble of launching the game again with Fraps, but if you happen to remember how it fared when you played it with the CPU you had at the time, that would be helpful.
Basically, I'm wondering if just getting a 7970 would enable me to play in Eyefinity, or if I need a new CPU, which would mean that I need a new MB, new RAM, and a new OS install, so I'd rather avoid that right now.