If have the same mobo (4PEA+) but my temp in the BIOS is showing 81 C degrees but MBM5 shows -23 C degrees.
So I have exactly the opposit of you.For MBM5 I choose "Winbond 2 Diode" this gives me the negative value.
What BIOS are you using? What date and where did you download it from? My BIOS shows me the wrong temps.
By the way, I am using the Prometeia cooling unit. I'm now running a 2.66 @ 3.01 all standard voltage etc. Nothing changed except the FSB raised to 150. My CORSAIR PC3500 CAS2 will be here tomorrow and then I can really test this mobo to the max
