CPU Clockspeed - wrong?

sprez · Feb 11, 2014

I don't get this. Forgive me for being rather noob.

I've got an amd athlon II x4 760k which is meant to run at 3.8ghz but cpu-z, speccy etc all indicate that the stock core speed is 3.3Ghz. Windows system information says its 3.29 Ghz.

Am I mistaken or is there something wrong here? Could anyone help me out please?

JOOK-D · Feb 11, 2014

That might be the default clock, and it might turbo to 3.8GHz.

Which motherboard do you have, and which BIOS version? It's possible there's an incompatibility.

First I'd run prime95 smallFFT test and look in CPU-Z: as long as the clock speed at that point is a stable 3800MHz then it's fine.

sprez · Feb 11, 2014

Dear JOOK-D, thanks for your answer. I've got an ASRock FM2A88X Extreme4+ Socket FM2+ motherboard with BIOS version P1.40.

x4 760k seems to be an fm2 processor, I don't know if that would cause problems with an fm2+ mobo.

I am running a smallFFT test right now but cpu-z still indicates a clock rate of approximately 3.3Ghz.
Any suggestions?

RobCrezz · Feb 11, 2014

Check in the bios you have turbo core enabled.

sprez · Feb 11, 2014

Seems like I have: http://oi58.tinypic.com/16giluw.jpg

But it still says 3.3Ghz

JOOK-D · Feb 11, 2014

sprez :

See where it says "Boost Frequency Multiplier"? Change that so it reaches 3800MHz

I assume it will be a x38 multiplier.

epicoverclock · Feb 11, 2014

Boost frequency multiplier needs to be set to X41 (4.1ghz) and cpu multiplier to X38 (3.8ghz). auto should set it automaticall to correct values
http://www.hardware.fr/medias/photos_news/00/41/IMG0041765.gif

sprez · Feb 11, 2014

Yea I just changed to auto for a try, it now says 3.79 Ghz in Windows so that's ok

I did not dare to change it manually before because I thought I would be oc'ing by putting it to x38, but auto gives x38 so I was wrong there.
I don't know why it was on x33 anyway but i'm glad it's fixed. Thanks for your help guys!

However, cpu-z now indicates a speed of ~ 4Ghz with a x40 multiplier.. I guess that must be the turbo? Since that should be 4.1Ghz: http://www.cpu-world.com/CPUs/Bulldozer/AMD-Athlon%20X4%20760K%20-%20AD760KWOA44HL%20-%20AD760KWOHLBOX.html

sprez · Feb 11, 2014

Yes indeed epicoverclock, that answers my last question. Thanks!

epicoverclock · Feb 11, 2014

yes, Its showing 39x-41x multiplier because it is in turbo mode

sprez · Feb 11, 2014

Excuse me for being noob again but why won't it reach 4.1Ghz now? x40 is the most i've seen now.

epicoverclock · Feb 11, 2014

Because it will only reach 4.1ghz if all the other 3 cores downclock. This is a good thing when running single threaded programs

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