Ok here's my original system which is hooked up to an APC battery back-up XS1500:
Phenom II x4 940 Black Ed Deneb core
8GB (4x2GB) Corsair Dominator DDR2 1066
Corsair CMPSU-850TX 850W PSU
BFG Tech BFGEGTX2801024OCXE GeForce GTX 280 1GB 512-bit GDDR3
MS Vista 64bit Ultimate
and the usual keyboard, case, mouse, networking card etc.
Ths computer never ran stable so talking with friends at a local comp store we decided there was a compatibility problem since the RAM was not listed as compatible with that mobo. So I ordered an Crucial
Ballistix 8GB (4x2GB) DDR2 800 BL2KIT25664AA80A. Installed that and the computer ran stable for a few months. Then the video went out, installed the video card into another system and it ran fine, so I took the video card to a local comp shop and they ran several tests on the card with no troubles.
We decided the PCI-e slot had become faulty so I replaced it with an ASUS M4A78-E. This computer ran stable for a couple months then I started getting stability issues, so I swapped back to the Corsair RAM, it ran stable for a little while, then it started acting up again, random crashing, odd blue screens, etc.. I took the computer in to the shop where it stayed for about 3 weeks, they had zero problems out of it. 3dmark06, and furmark all came back fine, temps remained tolerable. I bring it back and it runs fine for a few months, then start getting video errors, white and pink blocks randomly on the screen, and green and red lines which resemble an equalizer on an amp across the screen. I replaced the video card with one out of my other computer an EVGA 8800GTS, which runs fine for several months. It starts giving troubles, so I put it back into the other machine and put my GTX280 in this machine, which it almost immediately gives problems.
I talk to my friends at the comp store again, and we decide there is something with the mobo, since CPU is running. They say it either works, or it doesn't usually. So I decide to upgrade, I'm not extremely rich, but I want to try dual video cards so I decide to stick with my CPU and RAM, and the case. I order:
Microsoft Windows 7 Professional 64-bit
Antec TruePower Quattro TPQ-1000 1000W
and 2- DIAMOND 5750PE51G Radeon HD 5750 1GB 128-bit GDDR5
I also install a couple more fans since I will be adding twin video cards.
I assemble, install everything and it runs great, for about 2 weeks, then back to random crashing. When I play WoW, I get crashes and a Hypertransport sync flood error. I have even gotten that error once at idle. I usually leave it running all the time, and temps on Hmonitor stay below 50C. But I did notice that it never has a temp for core 1. It will also get into a rebooting loop sometimes at nights, it will wake me up just constanly boot, and reboot. I have run numerous tests, (my 3dmark06 scores were only like 16k) and everything checks out most of the time. I recently downloaded Hot CPU Tester, which it ran twice with no errors, on the 4th time it came back with errors in all 4 saying that the complex matrix tests didn't match. Memtest86 is hit or miss. Sometimes I'll get perfect tests, sometimes I'll get errors. I haven't taken it since the rebuild to see if they can test it at the comp store, but I am not made of money, and I am getting disgusted at it.. I built this thing in Feb 09, and it has been giving me trouble since.
It will run the same stability whether it has 1, 2, or 4 sticks of Corsair, or Crucial
RAM. I have also tried to boot in safe mode with nothing plugged in the USB ports, except the keyboard, mouse, and my network adapter. It is still giving the same errors on Hot CPU Tester, that the matrix tests didn't add up. I am currently testing it, and it is testing fine so far. It is driving me nuts since it is completely random. I visually inspected the ground going from the box into the ground and it is there, and well seated. A friend of mine said that if I was having any power related issues, the APC would alert me, or the breaker would trip.
Any ideas out there?