If you just want to see higher pointless synthetic benchmark numbers then upping memory freq. (and thereby breaking from 1:1) will help. It will not affect gaming performance at all, not a single bit.
Your particular RAM is capable of up to around 440Mhz (880DDR) @5-5-5 2.1V.
You can make more efficient use of that RAM by dropping your multiplier to 8x and increase FSB to at least 400Mhz (1600QDR) while keeping 1:1. 400x8=3.2Ghz