Some games, like sims, strategy, and mmo types tend to be cpu limited and single threaded.
Others like fast action shooters tend to be graphics limited.
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To help clarify your CPU/GPU options, run these two tests:
a) Run YOUR games, but lower your resolution and eye candy.
If your FPS increases, it indicates that your cpu is strong enough to drive a better graphics configuration.
If your FPS stays the same, you are likely more cpu limited.
b) Limit your cpu, either by reducing the OC, or, in windows power management, limit the maximum cpu% to something like 70%.
Go to control panel/power options/change plan settings/change advanced power settings/processor power management/maximum processor state/
This will simulate what a lack of cpu power will do.
Conversely what a 30% improvement in core speed might do.
You should also experiment with removing one core. You can do this in the windows msconfig boot advanced options option. set the number of processors to less than you have.
This will tell you how sensitive your games are to the benefits of many cores.
If your FPS drops significantly, it is an indicator that your cpu is the limiting factor, and a cpu upgrade is in order.
It is possible that both tests are positive, indicating that you have a well balanced system, and both cpu and gpu need to be upgraded to get better gaming FPS.
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If you think you need a better cpu, then something like a i5-4440 would be about 2x the capability of your I7-920.
If you think your graphics needs to be better, make it a big jump or you may be disappointed if you do not see great improvement.
Think GTX980 or GTX980ti.
I suppose sli GTX670 would be an option, but dual cards always seem to have issues.