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You modify the BCLK regularly whilst booted into Windows on the different Win 8 machines you handle? Even when overclocking you'd normally not mess with the BCLK unless you are really wanting to push your overclock.

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Windows 8 keeps terrible time on laptops or anything else which is trying to power save by varying the clock. I'm not overclocking shit. The OS just doesn't time sync frequently enough. This is why I posted a link about increasing the frequency of time syncs.

This has not been a problem with Windows 7, or XP on the same equipment.

That is not how the power saving works. It does not vary the BCLK rather it alters the multiplier. If it varied the BCLK by such large amounts to achieve typical low power frequency levels then you'd likely run into some catastrophic stability problems as the BCLK is also used by the integrated memory controller and QPI.

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