Off topic - I'm running 2000 MHz on my LGA 1366 and the differences are 4~8+ FPS and when the choice is chop vs smooth then yep ya sure do notice the differences. Next, faster RAM SQL testing cuts-off 10~15 on a 1+ hour run.
There's GOOD 1333 CAS 7 and GOOD 2000 CAS 8/9 then there's all the other RAM in between. The quality of the IC is where the differences are between RAM.
Even 2133 MHz + SB has it's advantages. Gaming is the most common place where systems are stressed; the SB IMC is fixed {BCLK} whereas most anything this is not the case.
My point is/was to be careful with blanket statements.