Title says it all. Specs are below. I bought this board less than 30 days ago and now that I have eliminated everything I possibly can, it seems like there is something wrong with the board. Scope of the problem .... PC boots fine and runs anywhere from 10 minutes to 10 or more hours ... then just decides to reboot itself. No BSOD, no errors in the event viewer, no errors in the BIOS. I've replaced the RAM, GPU's, power supplies. The only thing I have not changed out is the CPU, but at this point, I do not suspect it being the issue. There are NO heating problems or power issues. System is plugged into an APC UPS.
Intel DX79SI
Intel i7-3820 CPU
Thermaltake SP-850-M 850W PSU
PNY DDR3 1333 16G Memory
2x Gigabyte GV-R797TO-3GD 7970 GPU's (And yes, I am having the "Boot to Code 0" problem as well, but at least the cards initialize after windows loads. I used an old Nvidia GPU to get everything installed and working. Would be nice if Intel would fix this persistant issue.)
Corsair H55 CPU Water Cooler
Samsung HD502HI 500GB SATA Drive
Windows 7 Pro x64
Specific to the board, I've flashed to the latest BIOS and still have the same issue. I tried running Windows 8 Pro x64, issue still exists. I have replaced everything except the CPU and the problem still exists. No overclocking has been done, everything is stock until I was able to resolve this issue.
Any ideas?