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The Lynnfield was running at 1333MHz memory clock. Our original result was kind of disappointing, but luckily Ryan recalled that we were converting ticks to nsec using the wrong divisor (2.4, not 2.93)! This one looks like what we'd expect, beating the E5620 by ~600ms (nearly 20% less time for a ~20% higher clock).
Of course, we'll pay a penalty for lowering the memory clock to 800MHz, but hopefully it will not be terribly important as the prior E5620 benchmarks showed (~100ms).