Okay, well this is the test normally.
About 5 seconds before my computer crashed (about 5 minutes into FFXI this time!) my temperatures that were changed were:
Core: 50C (green tick?)
GPU: 50C (green tick?)
Everything else was the same. Hmm.
Note: Also I thought it might be Windower 3.3, but I tried uninstalling that and just using max default settings in the FFXI settings and it still does it (which it shouldn't).