I currently have a 4670k at stock speeds, will OC once my WC parts come in. I plan to purchase another 290 and a 1050W PSU. Will there be a bottleneck between the CPU and 2 290 cards?
getting two 290s for 1920x1200 is plain silly. and yes there are some poorly optimized games where your cpu will not give you all of even a single 290.
Considering its one of the fastest CPU's out there IPC wise, if there was a bottleneck you wouldn't know since there really isn't anything to compare to. OC to alleviate any bottleneck there might be. Get it up to 4.2-4.3ghz and you will be as fast as some of the fastest Sandy's and Ivy's.
The only thinga faster would be a 4770k or Ivy-E, and that's only if the game can use more than 4 cores or HT effectively.