dude let me clarify u something

its not only about coretemp...all  third party

this is the reply i got from gigabyte a few months ago
and here is the attached io pic that i got from them

[attachmentid=283475]

i did write to asus also and got a similar reply..

y all this questions... after testing a few mobos with x6800 using scyte infinity and coolit... i was getting weird temps with asus and gigabyte mobos compared to evga 680
second.... asus/gigabyte p5n32e-sli and n680dq6 ... everest was showing the exact temps as core temps. while evga 680 was like heaven and hell. ( this reaffirms the the statement given above... everest vs core temp)

i hope this answers some of ure questions... as for gigabyte .. i have tested my proc with a external sensor between the heatsink and proc... it was like 3C more than the gigabyte motherboard sensor.
my bet gigabyte got it right... as i am writing this my comp temp  for the qx6800 is now running at 3.6ghz 1.42v for the whole week .... gigabyte bios temp is 40C/64C ( Idle/Load) while core temp / everest is 72C/95C Idle/Load

go fly core temp heck i have tested by unplugging the pin of the pump for the coolit on the evga mobo and then only i can feel the heatsink is hot... other than that the heatsink is freaking cool.

so as for now... i do not trust core temps... for gigabyte motherboard especially  trust the bios readings..
hmm kindda dumb if u think the engineers are getting the temps wrong purposely right??? even after intel gave them all the info on how to design a 775 mobo to support qx and c2d...

final evidence... that again its all about the io's

using F3 bios vs F4 bios everest/coretemp difference is 10C.gigabyte motherboard cpu temp sensor difference 1C..

geee