Hey all. 2 months ago I built a new Crossfire socket 939 system. It's been a headache right from the start. I've been experiencing random lockups in games. I get that high pitched squeal of death, the sound loops for a split second, then the screen goes black and the system reboots. It did this three times over the past couple of days while playing COD2. Here's the even log created: I've attached the minidumps. I used WinDbg to take a look at them, and it seems to indicate a memory controller problem? I'm not sure though, as I don't have a lot of experience analyzing dump files. I'd like some help looking at the dump file and maybe some suggestions as to what might be causing this issue. Couple of things I've already done: -Format and reinstall of Windows XP Pro w/ SP2 all security patches applied -All drivers (mobo/videocard/soundcard/etc...) updated to most recent version -BIOS flashed to most recent release -AMD X2 Driver (/usepmtimer switch to boot.ini) installed -Windows X2 Hotfix installed and enabled -Disabled all nonessential background programs and services -Disabled "Cool and Quiet" in BIOS -Established that RAM is not the cause (exchanged the system RAM for known good RAM, problem persisted) -Prime95 Torture Test (blend test 8 hours no warnings, no errors) -Disabled AI Overclocking in BIOS (set it to manual 200 mhz) -VCORE OverVoltage is not enabled Also have memtest multiple times for multiple hours with no issues. A more detailed post of everything I've done w/ this system can be found here. At this point I'm happy to finally have some clue as to what's going on. Any insight or analysis of the dump files would be GREATLY appreciated. Thanks.