A friend has an E6300 running on an MSI-V7255 motherboard. He replaced the graphics card with an 8800GTX and changed cases at the same time.
In doing so he broke the CPU cooler and replaced it with a stock Intel cooler... but Coretemp reports an unlikely 123C(?) for both cores at idle, Speedfan Core temps of -39C thats minus 39C.
MSI's own utility , Dual Core Centre simplt reports the CPU temp as 68C, this duplicated by Speedfan.
I don't like the look of it.