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Problem: Intel i7-4770k running on 3(6) cores instead of 4(8).

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October 19, 2013 12:42:07 AM

Hello everyone,
A few weeks ago, I built my first gaming PC. As you already know, my CPU appears to have 1 core less than it should have and I am here to ask for your help fixing it or at least finding out if this is a case of a defected CPU or just a false BIOS configuration or something of that kind. Here are the details:

Description of my problem:
CPU-Z, Task Manager as well as the 'cat /proc/cpuinfo' terminal command on Fedora Linux show only 3 cores and 6 threads.
The other thing that was awkward, was that Intel Extreme Tuning Utility did recognize the CPU, but it did not recognize any cores, clock speed or turbo boost support for my CPU, there were also no configurations that could be done with the utility.

What I did so far:
I checked CPU-Z, Task Manager and Intel Extreme Tuning Utility twice,
once before and once after reinstalling Windows 7 64-Bit Home Premium.
I used 'cat /proc/cpuinfo' on a Fedora LXDE 64-Bit live-disk.
The HDD/SSD drives are pretty much empty right now and I won't hesitate to format the system.

System Specifications:
Motherboard: Asrock Z87 OC Formula
Power supply: Corsair ax1200
CPU: Intel i7-4770k
CPU cooler: Phanteks PH-TC14P
Grafics: EVGA Geforce GTX770 4GB Classified
SSD: Samsung 840 EVO 250GB
HDD: WD Black 1tb (WD1002FAEX-00YA0)
RAM: Corsair 2x8gb DDR3-1333/1600 (9-9-9-24) on slots DDR3_B1 and DDR3_B2
CD/DVD: Asus bc-12b1st
Operating System: Windows 7 64-Bit Home Premium (installed on the SSD)
Case: Cooler Master HAF X
Wi-Fi: Asus Wireless-N PCI-E Adapter PCE-N53
Last BIOS update: 2 weeks ago but still the newest available (as of 10.18.2013)

Thanks in advance.

Best solution

a c 164 à CPUs
October 19, 2013 7:29:37 AM

Do you try to either go to the BIOS cpu section to change setting or using RUN: msconfig>boot>Advanced options>enable all the processors"?
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October 19, 2013 8:44:07 AM

cin19 said:
Do you try to either go to the BIOS cpu section to change setting or using RUN: msconfig>boot>Advanced options>enable all the processors"?


Thank you very much for your response.

I did try the option in msconfig before, which did not have any effects.Just a moment ago, a changed the BIOS settings from '3' active cores to 'all' and reinstalled Windows and now I see 8 threads in Task Manager.

I still have to install drivers and programs to see if all my problems are fixed now (Intel Extreme Tuning Utility, CPU-Z and so on). I'll inform you as soon as I'm there (approximately in an hour or so).

Thanks for your help!
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October 19, 2013 9:39:35 AM

cin19 said:
Don't forget the intel chipset driver. https://downloadcenter.intel.com/Detail_Desc.aspx?Dwnld...


well, there was something called INF Driver on the Asrock CD
and everything seems to be running fine (CPU-Z shows what i want it to show, XTU can apply configurations now), thanks.

The XTU benchmark gives me a score of 537, do you know if that is rather a high or low score for a 4770k @ 3.9 GHz (I mean like: is this a score a fully intact one would normally have)?

Thanks in advance.
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a c 164 à CPUs
October 19, 2013 11:11:51 AM

First I don't run the XTU benchmark so I don't make the comment.
Yes, there is one in the cd, but you can get the newer one from intel website.
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October 20, 2013 12:10:22 AM

cin19 said:
First I don't run the XTU benchmark so I don't make the comment.
Yes, there is one in the cd, but you can get the newer one from intel website.


Thanks for the advice about the newer chipset driver, I'll do that later today.

I guess my problem is solved now.

Thank you very much for guiding me through!
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