Sorry John, didn't mean to insult your Quad. There's no reasonable explanation for the fact that the sensors on your center two cores that are only a few millimetres apart, are reading 14 to 15 degrees differently at idle. In the 65nm era, a good pair of sensors would report almost equal temperatures for two cores on the same die from idle all the way up if the load was well balanced.

Your Quad sensors are all over the place. I'm just waiting to see if Intel has a rabbit that they can pull out of their hat tomorrow to come up with a better way to get some temps out of these chips. My dream would be a second set of sensors that are 100% accurate from idle to TjMax that they forgot to mention them in their previous documentation. Probably not going to happen though.