I have an Intel DP35DP mobo, WD Raptor 150gb with two identical Corsair XMS2 DDR2 800 512mb sticks. I couldn't get winXP to see the harddrive whenever both sticks were in and it would crash during installation. But as soon as I removed the second stick, it immediately was able to install winXP with both PATA and SATA. Now that XP is installed, I put the other stick back in and it crashes whenever it boots up. I take it back out and it's fine. I've tested the ram by trading it out with the other. I also put it in all the other slots. I have the Ram timing set to 5-5-5-18 (auto-configured through BIOS). I tried 6-6-6-18 but that crashed as well.