OK, so this article got my interest piqued in some more CPU testing, which I have now done. I'm definitely curious to see how things shape up at final release, because according to the beta, this game is to CPUs what Crysis 3 is to GPUs.
My conclusion... at 1440p maximum settings, 780 SLI is CPU bottlenecked by a 5 GHz 2600k. That's insane, frankly.
Playing on a 64 man server each time, I played normally for 15 minutes and used FRAPS to benchmark the playtime. Here are the results (again, all on 780 SLI @ 1100/1500, Windows 7 x64, latest 330.41 beta driver). I am only reporting avg fps because minimum FPS seems to be all over the place in my benchmarking (anywhere from 20-40fps)... I think FRAPS is picking up some sort of framerate hitch that can occur when you die and go to menu.
2600k @ stock - 49.6
2600k @ 4.8 GHz - 70.0 FPS
2600k @ 5 GHz - 77.0 FPS
2600k @ 5 GHz, Hyperthreading disabled - 67.3 FPS
Only the bold results were fully playable. There was distracting sporadic stuttering at stock and at 5 GHz when HT was disabled that were annoying during gameplay. I'd consider the stock results unplayable, the 5 GHz w/o HT results were borderline playable. The thing that shocked me most was 100% CPU usage at 5 GHz without HT (when HT is enabled, games never load a CPU to 100% - it always loads to like 75% max).