ok, so, after checking, here is the answer from the architect himself (Ronak).

Everest is not threaded for the memory test, I verified with a Skulltrail 4.0Ghz and a Nehalem Big time OC, and both of them use 25% of the CPU during the test.
Memory bandwidth is so great in Nehalem that you need more than a single threaded test to measure fully the memory bandwidth.

Please use sandra for the time being, Everest will catch up soon I think.

Francois Piednoel
Intel Corp.