HD 7950 + 3470

Indeed, I think most sites would recommend the 7950 of those two based purely frames/second. Reason that Tech Report's recommendation is so different is that they're not testing frames/second (well actually they do, but they're testing something much more important alongside it).

Frame latency benching is a new way of testing performance, to more accurately represent the 'smoothness' delivered by a card. Frames/second is a crude, oversimplified measure of performance that doesn't tell the whole story. It gives a rough idea, but smooths out major dips and spikes in framerate. Performance on the GTX660 Ti (and it's more than likely this extends to the adjacent models from nVidia since it was likely a driver update that did this) was far more consistent and not up/down. We'll be seeing a lot more frame latency benchmarking moving forward, including from Tom's.

The conclusion:
"A moral victory in the borderline-meaningless FPS sweeps doesn't overcome the fact that the Radeon HD 7950 has a persistent problem with high-latency frames across a range of test scenarios based on the latest games... If you just want bragging rights, by all means, choose the Radeon HD 7950. If you're looking for the friction-free fluidity that only comes from consistently quick frame delivery, though, our recommendation remains the GeForce GTX 660 Ti."

EDIT: Although I've made it clear anyway, just want to double clarify that I'm aware the OP isn't looking at a 7950 or GTX660Ti, but that these GPUs are just one model up and the consistency/inconsistency findings likely apply, since the models are architecturally very similar.

I have i5 3470 myself with GTX 660, and it performs awesome.
But Please get a GTX 660 TI or GTX 670. Hardly Recommend.
Most of the 7950 nowadays are giving poor performance and laggin too much.