I'm not bashing XMS2 becuase it sucks but rather how people buy it becuase it has the name "Corsair" and thats it.
XMS2 will hit DDR2-1000 which is really fine but the HK's can hit that with CL4
HK's and HZ's will both hit 1200mhz easy.
Like I said Corsair has the best customer service in memory today and on average the ram will handle any overclock...but I just like people to be aware of this and how companies like G.Skill and Geil will be faster for cheaper.