I'm running an intel c2d e8400 on an evga 860i sli a1 mobo flashed with the p32 bios and I'm in the process of doing some overclocking (currently testing at 4.050Ghz). I want to push it further but I've heard about inaccurate temp reading with my mobo on cpu. I'm using speed fan and core temp which i believe displays the correct cpu temp but I'm not sure.
in my searching i found this http://www.xtremesystems.org/forums/showthread.php?t=179044 looks good to me i'm installing it now.
On my Gigabyte mobo, I have found speedfan gives similar CPU readings to the Gigabyte utility so seems to use the same sensors as Gigabyte for monitoring. I think I am comfortable with the readings from speedfan