Overclocking wise, how can we complain? These Mushkin modules were able to take us up to DDR2-640MHz at tight timings of CL 3-2-2-6 and up to DDR2-750MHz at its most relaxed timing. That's 217MHz over its rated speed. You get a headroom that is sure to handle even the most extreme overclock while running at the tightest possible timings. And with the cost of PC4200 modules getting cheaper by the day, the Mushkin 1GB PC2-4200 (533) Dual Pack is a great buy no matter where you look at it.