I just upgraded to 8gb of ram. The P5Q D can be picky to put it mildly with ram at higher clocks. I just finished up 40 runs of IBT with no errors. I am now running Memtest 3.8 on 4 threads with almost all of my ram at about 60% coverage so far. I am trying for 24/7 stable clocks, and don't want any corruption down the road. How long should I run Memtest? I plan on running it over night, it is pretty stressful should I be nervous to do that? How do you guys detect memory errors? What else should I do? Thanks in advance.