Well, this is frustrating. I have 4 x 2GB sticks of Corsair Dominator PC8500 memory in and seemed to be running stable at 5-5-5-15 (2T) timings at 1066MHz. I decided to run Memtest86+ and left it for an hour. I came back and it was on Test 8. Unfortunately it was showing 13 errors and displaying 10 errors between Tests 5 and 7. They were at assorted addresses between 1.1GB and 7.8GB. I really don't know what the errors mean and how serious this is. My Q9450 is at 3.2GHz (400 x 8) and my RAM is at it's rated 1066MHz (400 x 2.66). Voltage is at 2.16V. I'm not sure what to do...do I need to exchange all 8GB of memory? I don't want to sit around for days testing each module individually. Are there settings I should try in the BIOS to adjust?