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CPU Mask bit pattern to use


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Can anyone give me examples of cpu bit masks to use for a 4-core multithreaded cpu?


I tried variations such as 1001 for cores 1 and 4, 0xFF00FF00 for cores 1 and 3, etc.


None of these work as expected.  Do I need a prepend or postpend for binary?  The default for hex was 0x.



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It all depends on the logical processor ordering of your operating system.  On Vista and later Windowses ordering goes as:


Core #1 / HTT Unit #1

Core #1 / HTT Unit #2

Core #2 / HTT Unit #1

Core #2 / HTT Unit #2

... etc.


So to select Core #1 and Core #4, you would have to use a binary bit mask of 01000001 which is hex 41.




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Thank you, Fiery, that worked.


Initial run of Haswell i7 4770k at 1.15 vcore at 4 GHz produced these temps in AIDA64 stress test:


Mask:0x40 core1:36c core2:36c core3:42c core4:49c**

Mask:0x10 core1:36c core2: 39c core3:51c** core4:37c

Mask:0x08 core1:39c core2:51c** core3:41c core4:33c

Mask:0x01 core1:52c** core2:41c core3:42c core4:33c



Now I can push core 1 to it's peak and use adaptive with per-core.



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