AdamK47 - 3DS,
Please go to the thread in my sig, and talk to tillman. He clearly believes the off die thermistor is so close to diode temp that heatsink comparisons can be done(ie the Anandtech Heatsink review).
Mike
P.S. His temps are so far off, that at best, the c-orb is running at best with a core temp of 58C, 11C off his measurement.