OCing ram is alot harder than OCing your CPU i've heard
Yeah, I generally tell people it is. Stabelizing your CPU requires upping Vcore, and that's about it...of course keeping it cool also... but RAM requires upping dimm voltage, and playing around with the timings of the RAM which requires a lot of trial and error to find that perfect balance of good timings with a nice high MHz.
Also, keeping your components cool will keep any damage from happening or shortening the life span. High performance RAM is really meant for overclockers...if you don't plan on overclocking your RAM you might as well save some cash and get valueRAM. The high performance RAM uses Samsung TCCD IC's...meaning the actual black chips on the RAM, they are designed to run cool, and run high MHz with nice tight timings at low voltages....whereas valueRAM will have just generic IC's on them, that aren't suited for high clocks.
Also the circuit board the RAM is printed on has an impact on OC'ing. Brainpower PCB's (printed circuit boards) are among the best. Read about how to identify em here: