well for amd 64 processors ur ram becomes the same speed as ur htt. but u will need good ram to do this. u could also just set a divider to ur default 200 mhz or whatever ur speed is. For an examlpe, 5/6 divider becomes 5/6 of ur htt(5/6*htt). that way ur ram doesnt have to oc to the higher htt frequencies. u dont HAVE to have good ram to oc but usually people oc there ram with their cpu. and dont get ocz performance ram(what i have) cause it doesnt oc at all and i have to use a divider which i dont have a problem with. have it at low timings though so that makes up for it.
o yea and cooling helps alot 2. keep it under 50C for load.