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Disable cores on a Ryzen 9 3950X?

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9 Aug 2020
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Just wondering if it's possible. I'm not making use of all the cores and sometimes have my pc running for a few days at a time.

Just wondering if I can disable cores? IE only use 4-6

:)
 
Soldato
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Why would you need to? Don't unused cores throttle back to a few hundred MHz or even go to 'sleep' whatever that means automatically when not in use?
 
Associate
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As clv101 said, the machine can take very good care of the cores that are not in use at the moment, I would not disable them. It would be different if you were talking about threads, since some apps run better when multithreading is disabled.
 
Associate
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As long on your power plan the minimum processor state isn't 90, 95 or 100% (mine is 5%), unused cores will either be at very low frequencies or sleeping. Idling, few things running on background, my 3900x show a whole chip consumption of 30ish Watts. At 16p per kW, at idle, would take roughly 3 days to cost me 16p, without accounting for other costs.
Unless you're running on problems cooling the chip, or keeping a reasonable noise while doing it, no reason to cap the chip. Just the right adjustments required and the chip does all by itself.
Even a GPU, nowadays is quite clever with its power management.
Just make sure there isn't any app/service pushing the processor boost for no reason.
 
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Just wondering if it's possible. I'm not making use of all the cores and sometimes have my pc running for a few days at a time.

Just wondering if I can disable cores? IE only use 4-6

:)

The cores go to sleep when not in use, but if its something you want to make a bit more permanent then do it in the bios, you can effectively change it from a 16 core chip to a 12 core or 8 core chip, or just enable it to use just 1 CCD all the time thereby disabling half the cores, saves having another piece of software in your start up programs everytime your PC boots too.
 
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