Need Memory to hit 600mhz

Hey Ya'll - i'm lookin for some RAM that will be capable of hitting 600mhz. The fastest stock i've seen is the OCZ PC4400 Gold that runs at 550...has anyone used these sticks and achieved 600mhz or very close to it? Or Corsair's XMS series perhaps? Anyone that has had memory up that high please let me know what sticks you used. Thanks!!!

the ocz gold has a good chance cause they are employing ocz's best chips. also the newer tccd samsung chips in the pqi and ocz. 2.2.25 pc3200 have been overclocking very hi too