To my knowledge, no version of Everest has worked for me as far as retrieving even a single GPU temp. Rivatuner 2.07 is the only program besides Asus Smart Doctor (came with card) thats supposed to work with the 3870x2's and its slated for release a week from now.
Confirmation -
http://www.hardforum.com/showthread.php?t=1273749
I would say the smart doctor temps are probably a safe bet for now, although i couldn't tell you how Asus gets its temperature readings (be it from both cores averaged / highest core / or just a random pick).
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