just brew it! wrote:
While it is conceivable that the CPU is failing (especially given the overclock), I would still suspect the motherboard, RAM, or PSU before the CPU. Memtest does not find all faults, and a failing motherboard or PSU can definitely cause symptoms like this as well.
Try running your stability tests with only 2 sticks of RAM. Then swap in the other two sticks and run with those instead. See if the symtoms change.
Look closely at the motherboard for any capacitors that are bulging or leaking.
Consumer PSU testers don't test the PSU under realistic loads, and don't check how clean the power on the rails is, so they will only find major failures (e.g. a rail that isn't working at all). If you have a spare PSU you can try, swap the PSU and see if the symptoms change.
Okay, so I did a pretty good inspection of my motherboard (I've seen bad caps before, so I feel confident saying I don't have any obvious culprits). None leaking, none leaning, none bulging. All the caps look good.
Then I did two separate Prime95 tests with only 2 sticks (16GB 2x8GB) populated for each test - both tests failed within a few minutes. Then out of curiosity I pulled 2x4GB sticks from another system and tried those (so only 8GB 2x4GB). Currently Prime95 has been running for well over an hour with no faults on any core with the 2x4GB option. The only difference in the RAM (other than capacity) are that the 8GB sticks are rated at 1333, and the 4GB sticks 1600 (all timings, voltages, brand/model etc are identical). Also of note, the 4GB sticks were/are not running at 1600 (but instead at 1333) - even though I have BIOS set on all-auto for DRAM settings.
Finally, I discovered Intel Processor Diagnostic Tool (https://downloadcenter.intel.com/Detail ... s&lang=eng
) - and ran that, twice. Both runs gave me "PASS" results (regardless of what RAM was populating the system).
Really not sure how to proceed from here. Is my motherboard just randomly rejecting RAM that has worked perfectly for over a year? Don't really understand why the 8GB sticks error out so quickly, while the 4GB sticks seem stable...
Given your clean memtest runs, I'd suggest checking the disk for problems. I saw similar issues a few weeks back when a coworker's SSD was on the way out.
Thanks for the suggestion. I actually had installed a new SSD just a few weeks before this all started happening. I eventually pulled that drive, and returned it (thinking it was causing the issues). Then I went back to my previous drive (with the previous untouched Windows installation still there) - but continued having issues. I currently have installed a new SSD (as of about a week ago), with a fresh copy of W7x64 Pro directly from an Original OEM disc. Disk checks have revealed no faults with this drive yet...