I'll try to make this short, but need to give all the details,\nso......\n\ni have basically a gaming system for my wife. Built it for xmas and\nbecause i went high end with video card, i only got 2 gigs RAM. For\nthese few months, system has been ROCK SOLID, never a crash, fast as\nfast......everything great.\n\nFound RAM, same type i have in, had rebate going so i picked up\nanother 2 gigs.Shortly after install, system would kick out of WOW and\nback to desktop, giving memory error. You could always relaunch\nwithout reboot and launch WOW again till it happened again. Pulled\nnew 2 gigs and system went back to flawless operations.\n\nDownloaded free memory tester ([URL]http://www.memtest86.com/[/URL]) and did some\ntesting. I decided to do a baseline test using only known good 2 gigs\nram. Test fails hard and locks up system.Move 64k block test. And this\nwas with first 2 gigs ram that works without errors.Swapped ram with\nnew, was able to quickly isolate one defective chip, other seems good.\nNOW back to old ram that works flawless, installing both sticks, tests\nfails as stated above.BUT, if i take system down to 1, 1 gig stick and\ntest one at a time, both sticks pass, without a problem, multiple\ntests. IF i move one of these sticks to memory slot 1 instead of zero,\nthey still test fine. Only when both sticks are in does memory test\nfail.\n\nANd now as i writing, wife informs me my flawless system just rebooted\non it own, FIRST failure every. This is 1st ram, so i just swapped\nslots, but not ram. Moved ram in slot 0 to slot 1 and vise visa. SEEMS\nto be doing okay.\n\nsomeone got some idea's??