It's a brand new computer. DIMM DDR 333 PC 2700. It wont let me log into windows anymore and I keep gettin the blue screen of death. My comp was working fine when I had 3 x 512mb sticks in but I wanted to take one out so dual channel would work better. I have abit an8 ultra mobo, x850xt sapphire 256mb radeon, amd 64 3700, 500 W PSU, Seagate ATA 80gb harddrive