This is my system specs. AMD64 3700 939 MSI 939 Diamond Plus MSI 7800GT 1GB Kingston Ram Antec TPII True Power 550 Sony DVD-RW Double Layer Sony 48X CR-ROM WD 36GB Raptor 10k I just ran Mem Test and got 4 of the following with different word pairs: Memory error detected copying between word pairs # 70146140 and 70145970. See the online FAQ (http://HciDesign.com/memtest) for advice on what to do next. I read the site and does anyone know if it could be both modules or possibly just one. I will run on module by self and run test again. Test was run approximately for 4hrs. I plan on pulling my corsair ram off my back up pc and retesting on same system to see if I get same error on other ram, to see if its my board. Any advice would be greatly appreaciated. In the past when playing online for extended perior of time, my system has frozen while playing WoW or Unreal Tournament 2004.