I just followed those instructions and ran the test three times.
1. It reached about 71 degrees after 2 minutes and then my machine froze. It didn't BSOD, but had the same type of freeze which Skyrim gives me. I then tried to reboot twice and the machine turned on, but my monitor was not detecting a DVI input. This happens occasionally after rebooting when I freeze.
2. It reached 61 degrees after about 30 seconds and froze. Same issues with rebooting so I opened my machine and checked for dust. There was very little in there but I cleaned it anyway.
3. Ran the test for 6 minutes and it levelled out at 75 degrees. No freeze, but I may have got lucky.
I'll try and load Skyrim again.