Well, I set the affinity on one of the othos to 0 and 1 and the other to 2 and 3. Nothing produces more heat than orthos.
About the coretemp thing, it's actually a known issue that Arthur is working on for the 0.96 release. The affects many people and might be due to some trivial setting in the BIOS. Do you know of a piece of software that can read your BIOS settings and dump them to a text file? I know the P5B allows you to save "OC Profiles." I'd be cool to get them in text format and compare mine to yours.