Bios 2b01, and I went after this formula
http://www.arcticsilver.com/diode_calibration.htm
The problem is the the error probably isn't even linear, but this mobo definetly doesn't read Tbred diode correctly. I know there is supposte to exist a bios that enable that in socket thermistor even if the tbred is in. But I'm not changing bios because this one and especialy 2815 are the best.
I'll probably add Senfu temp probe so that it will touch the core, not as good as internal temperature, but at least error would be linear just offset few degrees from correct temp.
Btw. I also read on xtremesystems that one was got an answer from Epox techs (not the guy with that username) that the reading is way to high on tbreds and 8k3a