OK - having finally got my temps to a level I'm happy with, and a
beefier PSU as well, I decided to plug my IT8212 RAID card (Flashed
with the ATAPI BIOS) back in. CPU temp shot up from 37C to 55C.

Removed the IT8212 and the temp is stable at 37C again. Why should an
IDE card cause such a huge temp increase. I can understand a slight
increase owing to the additional IDE cabling (I gave each of my two
HDs, CDRW and DVD-RW their own IDE channel) - but not 17C.

Any ideas?