Intel i7 7700k only showing 2 of 4 cores and 4 of 8 logical processors

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anthonyduffy99

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Dec 26, 2017
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I just upgraded from an i5 7600k to an i7 7700, and ran a benchmark program and it only showed the processor was performing below average. Could it be something in the BIOS, or is it the processor itself?
 
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Could be a problem with your installation of Windows.

You can also click the Scan for hardware changes button in Device Manager, but I would reboot after removing the Processors group first. Clicking the button during the same Logon session of Windows in which you removed all the CPU entries won't cause it to re-detect them.

If you still have a Processors group in Device Manager, you haven't removed all of the entries from it.

Have you checked the Advanced options under the Boot tab of MSCONFIG to ensure that somebody hasn't limited the number of processors available to Windows?
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anthonyduffy99

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Dec 26, 2017
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I did that, i restored the default settings, then tweaked the cpu settings a little bit. The BIOS recognizes that there are 4 cores, but when i boot up the system it only shows the 2.

 
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bigpinkdragon286

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Oct 3, 2012
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There are occasions where Windows doesn't recognize a CPU upgrade, and see's the new CPU with the same configuration as the old one had.

If you go into Device Manager and remove all of the entries under the Processors group heading, then reboot, Windows will be forced to re-detect and reinstall the CPU.
 
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anthonyduffy99

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Dec 26, 2017
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I just tried that, but Windows didn't even re-detect the CPU, and it's still showing the 2 active cores. Could it be windows just being windows?

 
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bigpinkdragon286

Splendid
Oct 3, 2012
4,648
35
28,590
Could be a problem with your installation of Windows.

You can also click the Scan for hardware changes button in Device Manager, but I would reboot after removing the Processors group first. Clicking the button during the same Logon session of Windows in which you removed all the CPU entries won't cause it to re-detect them.

If you still have a Processors group in Device Manager, you haven't removed all of the entries from it.

Have you checked the Advanced options under the Boot tab of MSCONFIG to ensure that somebody hasn't limited the number of processors available to Windows?
 
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