jason4207: I have to disagree until more evidence is presented to the contrary. For all we know the DTS sensors are very close to each other on the die. The IHS has to be cooler, though.
Of course the DTS sensors are very close to each other. The core is about as big as your thumb nail so the large gradients that used to exist in the Pentium 4 era have been reduced to next to nothing. If one core at full bore brings the other core up to within 1C of it then at idle the difference between an IR gun IHS reading and the "real" core temperature can't be greater than that.

You don't have to go all the way up to TjMax when testing. At an IR reading of 60C, the DTS shows 35 on my E8400. at 70C is was showing 25 and at 80C it was showing 15. I plan to do some more high temperature testing when I get a chance to make sure the PROCHOT# feature is working properly.

Quote Originally Posted by leffe View Post
Confirmed. Although it shows idle temps around 60 when I'm cooling with water and U-guru shows ~30. Using Vista64.
Good news. That program is displaying the actual DTS reading and is accurate.