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#11
The part in bold red is'nt exactly correct. Windows will use what ever you have set in bios for the FSB. Your math is correct but your analogy is not. Windows WEI also shows me at 4050Mhz or 4.05Ghz.
For instance right now I'm using a 9x multi,450 FSB clock or 1800QDR speed, for my FSB yet the default for my Q9650 is 333 or QDR of 1333/4= 333.25.
With C1E and speed step disabled you get the true CPU frequency in CPUz.
I might also point out that with this overclock which is rather stout, there was no chance of getting it stable without disabling those power saving features. This is a 12 hour Prime Blend stable overclock.
Although as Wishmaster pointed out it is possible to get a decent overclock without disabling those power saving features, there are limits to how far you can get with them enabled though.