The CPUs are much faster than the games require. Any CPU for 100 Bucks will do the trick. If you want to see a significant difference, take out the GPU by lowering the graphics settings to the minimum.
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Or buy the top of the line GPU.
Obviously I don't - the Titan is the top of all GPU's - the 980 is second. I've found that second tier is a vastly better deal.
Honestly, the best bang for your buck is still the AMD R9-290, the Geforce GTX-980 will outrun it, but costs twice as much.
http://www.tomshardware.com/reviews/gaming-graphics-card-review,3107.html