We purposefully disabled SLI because of the CPU-boundness.
But it's not CPU bound, it's engine bound.
Running perfmon demonstrated this clearly enough. My CPU has 6 physical cores, 12 threads, and stock clock of 3.8ghz. The game never even achieved 50% utilization running at 1900x1200 on absolute max setitngs. From memory the highest my CPU's utilization reached was around a peak of 35%.
What i noticed however was the game would max out a single thread or two, then sit there doing nothing with remaining resources of my CPU. I mucked around with CPU affinity and thread priority, didn't seem to improve much.
It's not CPU bound, ratber COH2's engine is not making efficient use of the hardware available to it. Nothing surprising given its a new engine from Relic and its day one release. It will take some time for Relic to really iron out the bugs, get compatability up, and yes for vendors like AMD and Nvidia to release optmised video drivers.
The sollution to my problem isn't to overclock like you suggest. The sollution is for Relic to continue to improve and patch the game so CoH2 utilizes the hardware resources it has available to it more efficiently.
If an i7 3930k isn't good enough for this game i feel sorry for the 99% of other PC users that aren't running high end $500 + CPUs. As lets be honest, my CPU is in the highest end of the market and well above the standard or even high end user's.