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Locking Ryzen 7 clock speed

JTS_1401
By JTS_1401
in CPUs, Motherboards, and Memory
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3 minutes ago, RONOTHAN## said:

May I ask why? 

 

You should just need to set the multiplier to 36.5 and call it a day, but again, why? 

the motherboard keeps boosting 1GHZ despite the VM set to Manuel. I would prefer the CPU to run 2.65GHZ. Optimally the CPU should run at 700MHZ since that is the speed of my Pentium system. 

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2 minutes ago, JTS_1401 said:

the motherboard keeps boosting 1GHZ despite the VM set to Manuel. I would prefer the CPU to run 2.65GHZ. Optimally the CPU should run at 700MHZ since that is the speed of my Pentium system. 

If you want to set it to 700MHz you just need to set the multiplier to 7. Ryzen (at least Ryzen 5000, don't really have any experience with Ryzen 3000) has a multiplier range down to 5.5, so anything above 550MHz will work without having to throw the BCLK super low (technically if you wanted to you should be able to get 440MHz if you want to throw the BCLK to 80, but that can cause other issues).

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1 minute ago, RONOTHAN## said:

If you want to set it to 700MHz you just need to set the multiplier to 7. Ryzen (at least Ryzen 5000, don't really have any experience with Ryzen 3000) has a multiplier range down to 5.5, so anything above 550MHz will work without having to throw the BCLK super low (technically if you wanted to you should be able to get 440MHz if you want to throw the BCLK to 80, but that can cause other issues).

Does this mean I can make the CPU run at 20MHZ?

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Just now, JTS_1401 said:

Does this mean I can make the CPU run at 20MHZ?

Don't think you can get it that low, the BCLK would have to be at 3.6ish, which would definitely not work (the onboard clock gen with Ryzen IIRC bottoms out at 80)

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2 minutes ago, RONOTHAN## said:

Don't think you can get it that low, the BCLK would have to be at 3.6ish, which would definitely not work (the onboard clock gen with Ryzen IIRC bottoms out at 80)

Okay, I think I will set the VM to 14.01. Will this keep the CPU under 70C at max load?

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1 minute ago, JTS_1401 said:

How much will it affect performance in Minecraft 1.8?

it would be under 1/5 the performance. If you care about Minecraft performance you don't want to lock it. 

 

1 minute ago, JTS_1401 said:

and what would the power draw be at?

It's not exactly a very well documented thing, but it would be somewhere between 5 and 30W probably. 

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1 minute ago, RONOTHAN## said:

it would be under 1/5 the performance. If you care about Minecraft performance you don't want to lock it. 

 

It's not exactly a very well documented thing, but it would be somewhere between 5 and 30W probably. 

Can I make the CPU max out at 2.56 watts?

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Just now, JTS_1401 said:

Can I make the CPU max out at 2.56 watts?

Highly doubt it. The CPU likely can't even turn on at 2.56W. Heck, even the SSD, one of the lowest power devices in your system, draws double that on average. 

 

Why that oddly specific number? If you need something that low power you probably should invest in a Raspberry Pi or a Intel Atom based system. 

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1 minute ago, RONOTHAN## said:

Highly doubt it. The CPU likely can't even turn on at 2.56W. Heck, even the SSD, one of the lowest power devices in your system, draws double that on average. 

 

Why that oddly specific number? If you need something that low power you probably should invest in a Raspberry Pi or a Intel Atom based system. 

Basicly I have a fairly well speced Gaming PC and want the entire system to draw less then 40 watts.

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3 minutes ago, JTS_1401 said:

Basicly I have a fairly well speced Gaming PC and want the entire system to draw less then 40 watts.

Good luck with that. You're lucky if you can get a GPU to idle at less than 40W, let alone under load. 

 

If this is your goal, sell your machine and buy a laptop. You're just not gonna get it to draw that low of a power limit. 100W would be tough but reasonably doable, but 40W is basically impossible. 

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