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Seffs

macrumors newbie
Original poster
Dec 27, 2020
6
0
So I decided to do a test on the Mac
And found out it says it detected 16cores but uses 8...

could they be blocked?

Any suggestions?!
 

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cobra521

macrumors 6502
Dec 14, 2016
393
136
FL
Seffs,

Opaque result. What kind of test was run? What software? What hardware?

Tom
 

Seffs

macrumors newbie
Original poster
Dec 27, 2020
6
0
Hey Tom,

It’s the Mac Pro 2019
8 core 3.5
256gb ddr4 ram

and app test it’s memtest86
 

cobra521

macrumors 6502
Dec 14, 2016
393
136
FL
Seffs,

I think your result is normal. I ran memtest86 on my 28 core 7,1 and got:

CPUs found: 56
CPUs started: 28 CPUs active: 28

For some reason (I'm certain others can explain this, I don't know the answer) the number of CPUs doubles under some odd way of counting.

Tom
 

Seffs

macrumors newbie
Original poster
Dec 27, 2020
6
0
Seffs,

I think your result is normal. I ran memtest86 on my 28 core 7,1 and got:

CPUs found: 56
CPUs started: 28 CPUs active: 28

For some reason (I'm certain others can explain this, I don't know the answer) the number of CPUs doubles under some odd way of counting.

Tom
Hey Tom

thanks for checking!!
 

timerickson

macrumors regular
Jan 23, 2019
127
118
Your 8-core CPU has 2 threads per core, for 16 available "CPUs" in the way this tool is listing it.
 

Seffs

macrumors newbie
Original poster
Dec 27, 2020
6
0
Thanks but did yo get the results of Tom above? In his case 56core
 

blackadde

macrumors regular
Dec 11, 2019
165
242
It says 56 CPUs because he has a 28 core CPU with hyperthreading (28 cores * 2 threads = 56 'CPUs').

I'm sure your system is fine. Memtest86 probably just doesn't use SMT (simultaneous multithreading) or you have it disabled in the settings somehow.
 
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