Chainbolt at OCAU discovered a new tool for monitoring Core 2 Duo cpu temps called Intel Thermal Analysis Tool (TAT) http://anonforums.com/builds/TAT.zip

Looks interesting, for my E6700 B1 on Asus P5W DH @3600Mhz - 10x360fsb at 1.4v bios at idle, TAT reported 2-3C hotter than Coretemp app but under TAT 100% load test, TAT reported 2-5C cooler than Coretemp app.

So break down for idle to load and delta temps for:

Coretemp
cpu0 idle = 34-35C
cpu1 idle = 37-39C
cpu0 TAT load = 66-68C
cpu1 TAT load = 66-68C
cpu0 Stressprime load = 65C
cpu1 Stressprime load = 65C

TAT
cpu0 idle = 36-37C
cpu1 idle = 40C
cpu0 TAT load = 65-66C
cpu1 TAT load = 64-66C
cpu0 Stressprime load = 59-60C
cpu1 Stressprime load = 59-62C

Asus PC Probe2
cpu idle = 27C
cpu Stressprime load = 51C

I love this place, so many sick individuals it's just like home!