Actually, the spindle drive was mentioned because the advantages of performance is likely hindered by the drive system. In addition, if the CPU is clever enough it might have greater idle periods when the drive is holding the system back - just a WAG though.
Um, we're talking about comparing power usage of two systems using the same drive. If the drive is a bottleneck, it'll be a similar bottleneck on both systems.
I wouldn't call 1-2% gain with a 33% boost a lot:
http://www.anandtech.com/show/2663
Depends on the test - TR shows a difference of 15 Watts (6%) peak power draw in Cinebench rendering for a simulated vs real i7-940.
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