mrman, what is your motherboard. it might not be the memory holding u back from OC heaven((will need faster ram for over 150/with crucial 2100 i hit 155Mhz/ i got samsung ddr3200 256 runs @ 166 cas 2,2,5,2 t1 no prob and no added volts)). It might just be a setting that is not letting you achive what you want. for example, after messin with bios settins for 2 days, i finally found out that if i wanted to go any higher then 146MHz FSB i needed to set my DQ command at fast or normal for the CPU on my ABIT kr7a. Once i did that 166Mhz was easy. and it could go higher but i didnt want to push it.. my goal was 166. Make sure that u have compound on the HSF on your northbridge. and for more info corsair uses hand picked modules form companys like samsun to get there XMS type memory. best bet is NEWEGG.COM they have good return policy.