Locking up computer - CPU Vcore experiencing massive fluctuation(33%)

BAH! The computer locked up with a new video card. Same as usual.

I had no lockups for 46 hours using Intel HD graphics. This lockup occured about 7 hours after installing 6770.

It looks like we are dealing with a:
1) Bad PCI connectors on mobo
2) PSU issue

This is what I will be advising my retailer to test tomorrow, as I am cutting my losses and bringing the computer in. It's free repairs but honestly, I preferred to not have strangers meddling with my parts (hence this thread). Oh well.

Any other suggestions on what the problem can be now that it's locked up with 2 PCIe cards, but is stable when using Intel HD graphics?

I suspect this is a memory (or CPU) problem. Download memory diagnostics and run them at boot time for an hour or so.

Or alternatively, run Prime95 with the settings as I previously suggested.

As you first posted:

- Anything in a USB slot can still receive power. However anything new plugged into USB cannot.
- The lockups occur randomly; sometimes when nothing is running at all but the OS.
- All functionality is gone.

Doesn't sound like a video card issue IMO.

Well great. After over 1 year of no problems, the same issue has returned after doing a repair install of Windows 7.

I've re-installed all my drivers but still getting the same random freezes as before.

Any suggestions?