Probably. I turned up my 2500k to 4.4ghz to avoid any cpu bottleneck in any cpu intensive games and benchmarks. I honestly don't know the performance comparison off hand, but I'd assume that you'd see some bottleneck, but not a ton.
I ordered it off amazon for $225 with $25 MIR. I purchased it using gift cards that I purchased (completely morally and legally) at ~45% off which means after I receive my MIR that it will have been that cheap. I could have gotten anything I want at that rate, but honestly could only justify going CFX instead of getting something such as a titan or 780. $100 for greater performance as opposed to $400 for a single card.
Edited by Shiromar - 9/21/13 at 6:36pm