Memtest Freeze

[L31101]

hey guys, i got got the OCZ Plat Rev 2 PC3200 2X512. Every thing is set at default, running at 2-2-2-5. the only exception is the DRAM voltage at 2.8 from 2.6. I couldn't run the ram at 2.6, i would get the blue screen of death, and quickly the windows would start. But after bumping it to 2.8, it is working now. My problem now is the memtest. I got the newest version on a floppy and ran it, but it would always freeze after about 15-20 min, without any error postings. Once it went 2 hours. Does anybody know what the problem is? i am new to this so any help would be appreciated. I haven't tried prime95, as i'm afraid too My cpu is also at default, no OC. I used to have a corsair ram and i was running everything at 235x11 very stable. Otherwise my rig is the same. Thanks

edit: the last two tries, the memtest faild on test 8 right about the same time...at 16:50 or so.