Hi FZ,
I have just done all that you suggested. For The Fix it worked fine and my Event View got cleaned of the WMI log.
I have changed the PCI Slot for the Video Card.
After that, I went into the BIOS Setup and put back the USB 3.0 (Since I see this was not the cause of the problem), and put the Performance Memory Profiles to Automatic.
After that, I started up the Windows 7 and run some tests. Again it fails on the GPU tests on OCCT. Just after a minute from starting the test, the machine reboots, just right after it shows a full screen image.
I got some print screens of the tests and some pictures from the BIOS Setups bellow.
