Intel V8 - Performance Preview of New Mac Pro's?

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I was looking at a preview of a Dual X5365 (Quad-Core) V8 system and was shocked to see the disparity in Cinebench scores.

Barefeat's 8-Core Reports a Score of 2323 for Cinebench 9.5UB.

http://barefeats.com/octopro1.html

Driver Heaven's 8-Core V8 System Reports a Score of 2445.

http://www.driverheaven.net/reviews/intelV8/cinemax.php

122 Points is a 5% Difference which given all other things equal is pretty surprising.

Is the Windows version of Cinebench reporting higher scores?

Any other thoughts on the disparity?