Originally Posted by mrtn400
It's about 26c. And once again this isn't a question about temps it's a question about lapping.
With that grain of sandpaper, it would only be good for making the surface of your Tuniq and/or CPU flat, but it would probably wear off a ****ton of the heatsink surface on either. I'd start at a grit of 800 and then work your way up to 1500-2000 for a smooth, polished surface.
As far as the differentiation in core temps go, that happens with most quad cores. As we speak, I'm idling at 36/37/33/38 @ 3.6GHz 1.44v with a 31c ambient. Quad cores will have differentiations in their core temps, but if you decide to lap your CPU, the differentiations will be reduced.