Corsair XMS fail to overclock after 200mhz in Overclocking and Cooling Posted October 4, 2006 I've seen alot of guys including my self dissapointed in Corsair XMS. Mine tops out at about 235MHz (never really tested for stability in Memtest, just prime95), and i've heard of some that have been worse. What is the highest that you can run the RAM at? And as for the fact that your friend had it running at 280MHz doesn't mean it will do the same in a differnt system. I hear that alot on these fourms.