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Windows 7: Overclock problem?

22 Dec 2010   #11

Windows 7 Ult, Windows 8.1 Pro,

Quote   Quote: Originally Posted by Nemix77 View Post
@ Devilz

The answer is simple math.

The default FSB for a Q6600 is 267 Front Side Bus and the default multiplier is 9 which is 9 x 267 = 2403 or 2.4Ghz Default.

You have overclocked the FSB to 400 and the lowed the multiplier to 8 which is 8 x 400 = 3200 or 3.2Ghz.


Now, Windows will always use the default FSB for your CPU (no matter what the overclock is) but use the modified multiplier value (weird but true) so Windows sees your CPU as 267 (default FSB) x 8 (modified multiplier) = 2136 or 2.13Ghz as shown in your Windows system information Q6600 @ 2.4Ghz 2.13Ghz.

Just to see if my answer is true, try going back into your BIOS and change the multiplier to 7 while keeping FSB at 400, boot into Windows and your system information should be shown as Q6600 @ 2.4Ghz 1.87Ghz.

End phrase, not to worry as long as CPU-Z shows your CPU is running at 3.2Ghz your overclock is successful. And the fluctuation in your CPU just means is going into low power mode (C1E in BIOS and Power Options in Control Panel > Minimum Processor State), it has nothing to do with the overclock as long as your system is stable.

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.

Attached Thumbnails
Overclock problem?-everest-temps-cpuid.png  
My System SpecsSystem Spec
23 Dec 2010   #12

Windows 7 Professional

That's not a Windows system picture you have there. I know that on my system does not matter the FSB Windows will always use 200 as my FSB times the CPU multiplier. I know I could be wrong but I'm sorry you have not corrected me in any way.

My System SpecsSystem Spec

 Overclock problem?

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