I have been through four ECS P4M800PRO-M v2.0 boards. The first board came from Fry's with a Pentium D 915 combo. After barely getting Windows XP sp2 installed, I would get random reboots. After changing everything from PSU to RAM (PC2100, PC2700 only DDR), I exchanged the MOBO for another model. This one too randomly rebooted, but if I manually set the RAM at the lowest clock it would not reboot as much. I noticed this with all DDR modules. After one last ditch effort, I returned it (thanks to Fry's) for a third board. Having little to no hope, I installed all my components [Antec 350 Watt PSU, 768 DDR RAM (Kingston 512 RAM and another brand of 256 RAM), Sony DVD+/-RW and same CPU] and everything worked flawlessly. I was able to play games (Jedi Acadamy .. again) even with the onboard video (no graphics card installed). After three months, the network port stopped working as did a USB port that my mouse was attached to. Moved to another port to keep mouse working and installed a NIC. All's well for a while and then it was the return of the random reboots. I was fine for three months with the third board. I RMA'd it to ECS and got the board I am using now. Unfortunately, it random reboots too. I may not be able to finish this post, but so far, so good. I changed RAM to Samsung dual-channel PC3200, even though the board doesn't support the advantages (speed increase) of dual-channel RAM. I still get the random reboots. I have the latest BIOS 12-14-2006 installed. Funny, the board came with an older BIOS from ECS. I ran a memtest from HCI systems. You have to run it for a long period of time. It found errors, but it doesn't mean they are RAM errors. I know the RAM is good, since the ones I'm using now came straight from my Dell that never had issues. The PC2100 RAM worked fine in the third MOBO (until it tanked as stated earlier). This forth board is a tease, since it mostly works. I used the default BIOS, but have just made changes. I know it won't remain stable since the memtest failed. The memtest mentions it may a problem with the MOBO and not your RAM. It recommends using one chip and run the test again. If it fails, it is most likely the MOBO. I am absolutely convinced it's the MOBO. If you luck out and get a good one (few and far between) your system may be stable for a while. I will end up purchasing a different MOBO over trying the DDR2 Kingston model recommended. I have never tested with DDR2, but I bought a stick for board number three. I never opened it because it worked well (for three months). I returned that DDR2 RAM unopened. There is a problem with this board. I may try to RMA it again and go for board number 5, since I am glutton for punishment. It's not the PSU. The one I have is new and has all the recommended amperage per rail as ECS tech support suggested. I did every bit of trouble-shooting recommended by them as well as my own. Being a BSEE has its advantages. Regardless, www.hcidesign.com has a nice memory tester that works in Windows and can aid in identifying the problem. It won't solve it though. I never received the BSOD on any of the four MOBOs. It just restarts like you hit the reset button. And as I did return two boards to Fry's, they had a stack of these (14, I counted) as returns. I only received new boxed editions when I got mine. The results I know will be for me to buy another brand of MOBO for my Pentium D 915. Just thought that I would chime in. I originally got my board in Sept. of 2006 and now it's May 2007. Faulty hardware must be swapped out. Much time, forum reading, trouble-shooting and contact with ECS was put into this.