well then y do some people get 4 gigs running and some 3, i think it is hardware, not the os, cause i cant run more then 4 gigs on my fx 939 system and that has a single cpu and memory controler, but my opti system has twin chipsets with 2 cpus, and i have no problem using more then 4 gigs or three gigs, W/E. Im tired of getting in this agument with people. any of you are welcome to come to my house and see it for your self.