Long time observer, first time poster. Thanks for having me.
I have an AMD FX 8150 (stock clocks) in a Gigabyte GA-970A-D3 board with updated F9 bios. I'm also running 8GB (2x 4gb sticks) of GSKILL RipJaws DDR3-1600 @ CL8-8-8-24. I've also used Corsair brand with the same speed/timings.
In addition, the PSU is an 800 watt Xtreme Gear, and GPU is Nvidia 550.
CPU is cooled by CM Hyper 212 + and idles around 28-30C and goes no higher than 45-50C under heavy load. Case cooled by 6 Rexus Top Motor 120mm fans at around 110 CFM. Case ambient temps are around 25C idle and 30C under heavy load.
The OS is windows 7 64 bit ultimate, freshly installed and updated with everything including bulldozer hotfixes. I have not installed any fluff programs or anything other than drivers at this point.
Upon running Prime95 or any game that puts the system under heavy load, I get a complete system lockup. Everything freezes, keyboard doesn't work (including num lock) and I am forced to hard restart. In bios immediately after freezing, temps are low, with CPU around 40C and Ambient around 27C.
Starting windows back up I sometimes receive error message "Windows has recovered from a serious error." Other times no message appears.
This build was causing the owner issues in the same way from before, I attempted to repair by doing the following:
1. Re-seating the ram.
2. Replacing the ram.
3. Increasing cooling.
4. Fresh install of windows w/ all updated drivers.
5. Re-seating the processor.
6. Removing expansion cards (1394 and others).
7. BIOS Fail-Safe defaults.
8. BIOS Optimized defaults.
9. BIOS Customized with optimal settings (per my own selections).
10. Ran Memtest and Memtest 86+ and received errors on test # 7 with all ram modules (gskill and corsair) in all slots tested one at a time.
I am assuming this problem is either AMD CPU related (as the memory controller is on the CPU itself), or the MOBO itself is faulty, or the PSU is not giving the CPU enough power when it needs it.
Bottom line, how would I go about isolating the problem at this point without purchasing another CPU/MOBO/PSU to test it with?
Thank you, sorry for the huge post.