The benchmarks show the lower-latency 4GB Dominator kit outperforms the higher capacity Corsair Vengeance in the performance benchmarks, but it is harder to quantify the boost you get from doubling the amount available.

What is evident though is that if performance is your mantra then going for higher speed RAM as opposed to more of the same will garner you far more raw pace.

Memory bandwidth

Corsair vengeance 8gb ddr3 1600mhz - benchmarks

Gaming performance

Corsair vengeance 8gb ddr3 1600mhz - benchmarks