OK, got XP installed and now stress testing at stock, on the stock cooler (a nasty small aluminium thing). Coretemp doesn't work and I think it's the top Temp1 that is the socket temp (peaked at 57C so far).
Is 1.25V the default voltage, can't find any information to confirm it?
I'm using an original AM2 Asus M2N32-SLI board that I've had since AM2 came out, with the latest BIOS release (only one that worked).
Jokester