Ok, so for a while ive been running 1 stick of 512DDR pc400 ram. Well, the other day I thought id pick up a second one. Now, since I got this, ive been experiancing game crashes ever 5-10 minutes or so. I ran memdiag and everything checkout out OK, but the crashes are still happening. I removed my original stick to test it out with the newer one i bought, and it seems to work fine. So I guess the issue is some compatability problem between the 2. But they are both the same type and I dont know what might be causing it.