AMD FX-6300 Showing only 2 cores maximum

Bamse · Jul 16, 2014

Why hello there! I installed a new CPU today, a six-core AMD FX-6300, BUT..it shows only 2 maximum in windows related apps and in CPU-Z. Help

My specifications:
Mobo:ASUS M5A78L
CPU:AMD FX-6300
GPU:Sapphire Radeon HD7850 2GB GDDR5

https://imageshack.com/i/ewba8dcaj

Dark Lord of Tech · Jul 16, 2014

What BIOS version do you have?

Bamse · Jul 16, 2014

The latest one, 1701, I already read that it supports my CPU.

Bamse · Jul 17, 2014

Anyone? Please help

simon12 · Jul 17, 2014

Look in the bios and see if there are any settings that look wrong and to see if the bios can see 6 cores or not.

Bamse · Jul 17, 2014

simon12 :

I've already went into bios and checked, it says:
3rd and 4th cores-Enabled
5th and 6th cores-Enabled

simon12 · Jul 17, 2014

Have you reinstalled windows since upgrading? What CPU did you have before?

Bamse · Jul 17, 2014

I had a AMD Phenom II x2 565 Black Edition, and no, I have not updated windows since yesterday when i installed it.
@simon12

simon12 · Jul 17, 2014

Are you saying you last installed windows with the Phenom before you upgraded the CPU? If so reinstalling windows will most likely fix it.

Bamse · Jul 17, 2014

simon12 :

I had the Phenom when i upgraded to Windows 8.1 2 months ago or something like that, so I need to reinstall Windows 8.1 then?

simon12 · Jul 17, 2014

Have you reinstalled windows (not updated but reinstalled from scratch) since installing the new CPU? If not do so.

bmacsys · Jul 17, 2014

Bamse :

What about your second core?

bmacsys · Jul 17, 2014

simon12 :

I swap cpu's all the time without doing a re-install and never have a problem.

Bamse · Jul 17, 2014

@bmacsys
Well the 1st and 2nd cores aren't able to be changed, they are enabled from the beggining.
@simon12
I installed Windows 8.1 when I had the phenom, from Windows 7 Ultimate 64-bit.

simon12 · Jul 18, 2014

If you can't find anything wrong in the bios (and have tried resetting it to default) I suggest you try a windows reinstall

Bamse · Jul 18, 2014

simon12 :

So u mean just putting in the CD and launching it from the desktop and just reinstall? Won't I lose everything on my PC then?

Bamse · Jul 18, 2014

I can tell you all fellas that I fixed it! Just by uninstalling all the cores in Device Manager and then restarting.
http://gyazo.com/482f44d42d5c2383a23631d9062aa7ff
http://gyazo.com/8dd85e6e4d0cfb70c35024bc137f809e
Perfect! Thanks for all the replies and for your time.

Bamse · Jul 18, 2014

For anyone else with this problem I redirect u to http://answers.microsoft.com/en-us/windows/forum/windows_7-hardware/howto-get-windows-7-to-detect-your-new-multi-core/71519d51-f6cb-47df-b3ff-66c2928d6de4

AMD FX-6300 Showing only 2 cores maximum

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