Help me understand CPU bottlenecks

Hi to all from Toms hardware,

I have been thinking of adding a second HD 7970 to my system (specs below) to increase performance of recent titles like Crysis 3. Many I have spoken to have suggested that I would bottleneck my first generation i7 too much to justify the extra $ I am about to spend.

Firstly, I understand the basic concept of 'bottlenecking' a CPU, but does the same concept apply to GPU intensive games like Crysis 3? In theory, should the addition of a second 7970 not take load away from my CPU as opposed to 'bottlenecking' it when I am playing at 'max' graphical settings? Its probably worth adding that I am looking into purchasing a 2560x1440 monitor, which should justify the addition of the extra 7970. I wont be able to buy the new card, the monitor AND a top of the range processor which brings me to my dilemma.

Sorry if this is a bit of a dumb question, but I have received so many different answers that I no longer know what exactly to believe.

Also, I have heard that OC'ing my CPU could solve this potential problem. I am not opposed to doing this, but lack the sufficient experience to be confident enough to just 'jump in' and do it. What are my other options? Will my CPU really be that much of a bottleneck?

I used to run two gtx 570's in SLI before settling for one higher end card, and the only problem I was facing was the lack of Vram on those cards. i didnt personally notice any significant bottleneck on my CPU's behalf.

Any advice appreciated!

i7 960 @ 3.2GHZ
Asus rog Rampage 3 extreme mobo
Asus HD 7970 Direct cu2
12gb Corsair Vengeance ram (3x4gb)
1000W Corsair HX PSU
Windows 7 64 bit