I'm planning a "Haswell" build and trying to decide what RAM to go for. In the process I came across this chart:
The whole review
is a must read
to put those figures in perspective and contains many more benchmarks, some of which do reveal more significant differences. But for the sort of real world applications I'll be using I think the 2133C9 Dominator offering is the sweet spot. It runs that 2133Mhz at 1.65V and even features subtle downlighting.
Unless you can persuade me there's a better choice...