CPU bottlenecking is a bit of a myth if your CPU is "fast enough". This sounds like a circular statement but the reality is that provided you are running at standard resolutions (ie 1080p+) at max settings, your rig will almost always be GPU bottlenecked, even with the most powerful GPU setups. CPUs for which this is true include all quad core i5s and i7s of this generation and the last and probably also quad core AMD processors at 3GHz plus.
If you ARE being CPU bottlenecked then at least one of the following statements will be true:
- You are running a low end or old CPU
- You are running your gaming at very low settings (in which the frame rate will be so crazy high that CPU bottlenecking doesn't matter at all)
- You are running a GPU setup that's so powerful that it has not yet been invented
- You are running an extremely CPU intensive game
Your i7 3820 is similar in power to my 2700k. I run a single 680 and can confirm that the CPU is barely even 20% utilised when the GPU is maxed out at a constant 100%. Simple arithmetic shows that 3 screen surround will require triple the GPU power of 1080p, yet with dual SLI you only have double the power, so no, your i7 3820 will not be a bottleneck (or even close)