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Sorry to bump this thread, but I may have an explanation for why that Xeon ES appears to be able to use a baseclock strap ratio. The number of cores, clockspeed, and cache all appear to match the 3960X, suggesting that this may be a qualification sample of the Xeon E5-1660, the Xeon equivalent of the 3960X. If the pattern follows the i7-990X and the W3680, the UP E5-1660 and 1650 should have unlocked multipliers and strap ratios. That would explain the anomalous success with this Xeon, with the many reports of non-functioning strap ratios on the DP Xeon engineering samples.