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How to fix Unknown CPU Error in About This Mac

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If you get the Unknown CPU in About This Mac you can use the following settings according to your processor.

Use IORegistry Explorer or IOJones to check the current "cpu-type" value for your processors. You can find the value by clicking the CPU0@0 like shown in the picture below:



I have an Intel Core i7 6700K so the value is 0507.


For Core i3 Series you can set the CPU type to:

0x0309 = Core i3


For Core i5 series you can set the CPU type to:


0x0601 or 0x0605 (to be more accurate) = Intel Core i5


For Core i7 Series you can set the CPU type to:

0x0701 or 0x0705 (to be more accurate) = Intel Core i7

You can also try 0x0507 if the values above didn't work.


For Xeon Series you can set the CPU type to:

0x0505 Dual-Core Intel Xeon

0x0510 Quad-Core Intel Xeon

0x05A5 Quad-Core Intel Xeon

Edited by Cyberdevs

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8-Core Intel Xeon E5

Intel 5960X


Screen Shot 2018-07-27 at 4.00.49 PM.png

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