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5 Posts

01-11-2021

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P620 Underclocking Potential

2021-01-11, 22:14 PM

I'm looking at purchasing a P620 with 3945wx/Windows 10, primarily for its expansion/connectivity capabilities. 

 

Since it will be on almost all the time and using relatively small amounts of CPU, I'm wondering if I can dial down the CPU base clock to save on energy and heat?  Or does that happen automatically?

 

Something like a 2.50 GHz base clock sounds like it would be nice.  If so, can you give a clue about how I would do it?

 

Thanks a lot,

Dennis

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33 Posts

01-04-2021

RU

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Re:P620 Underclocking Potential

2021-01-12, 6:52 AM

Naturally the proc will clock down according to load. Just be sure to enable power-saving features in BIOS similar to Intel Speed Step (donno what AMD calls it).

If you want more control you can use soft like Intel XTU or ThrottleStop (there are many other) to manually set the lower/lowest possible multiplier to set a constant speed no matter what the load is.

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4838 Posts

02-22-2010

NC

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Re:P620 Underclocking Potential

2021-01-12, 12:49 PM

The Threadripper Pro CPUs will operate at a lower base clock setting by default when not under load.  They will then scale up frequency to the max boost clock as needed.  So for example on the 3995WX TRP CPU (64-core part), the base clock comes in at 2.7GHz while the max boost clock will get it up to 4.2GHz.  For the 3945WX, I think it's 4.0GHz base clock with a 4.3GHz max boost clock.  But keep in mind that 12-core part also does not typically run the CPU power as high in the 280W TDP envelope as the 32 and 64 core parts do.

 

I would highly suggest simply letting the CPU do it's own thing here.  There's really no reason to try to jump in to manually set the clock speeds to a lower level during idle.

 

@Cromanin - I'm pretty confident the Intel XTU software is not going to work on an AMD part.  I can't speak to throttlestop's capability.  However, I'll reiterate that using this software is not supported nor recommended by Lenovo.




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33 Posts

01-04-2021

RU

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Re:P620 Underclocking Potential

2021-01-12, 14:32 PM

Yeah you right ofc XTU wont work here ) I am just not familiar with AMD alternative and XTU was just an example.

 

Agreed on using 3d party software, it is always better to use built-in power saving tools.

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