F5F Stay Refreshed Power Users Overclocking No, there is no feasible method to undervolt EPYC CPUs, especially Zen2 variants.

No, there is no feasible method to undervolt EPYC CPUs, especially Zen2 variants.

No, there is no feasible method to undervolt EPYC CPUs, especially Zen2 variants.

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SophiaUchoa
Junior Member
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20
12-31-2021, 12:51 AM
#1
Hi, I've put in a lot of effort to reach where I am now with these components...
- H11DSi (supermicro mobo)
- 2x AMD EPYC 7k62
- 16x 8GB of 2933MHz RAM
- A clean Linux live server OS (43470)
...everything is working well but I'm looking for a concise solution. Can I possibly adjust the voltages? (Not just changing power states, I want to maintain performance levels and try reducing energy use.)
It seems like a solid balance between performance and efficiency by turning off the performance boost, but I've noticed that other adjustments might help. Maybe I'm misconfiguring something. Is there anything else I can try? Since we're discussing server CPUs, I'm not sure what to expect from search results. So I'm hoping you can offer some advice.
My main goal is to maximize performance per watt. If this isn't the right forum, let me know. There are many helpful discussions online, but I'm not sure where to start. Undecided
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SophiaUchoa
12-31-2021, 12:51 AM #1

Hi, I've put in a lot of effort to reach where I am now with these components...
- H11DSi (supermicro mobo)
- 2x AMD EPYC 7k62
- 16x 8GB of 2933MHz RAM
- A clean Linux live server OS (43470)
...everything is working well but I'm looking for a concise solution. Can I possibly adjust the voltages? (Not just changing power states, I want to maintain performance levels and try reducing energy use.)
It seems like a solid balance between performance and efficiency by turning off the performance boost, but I've noticed that other adjustments might help. Maybe I'm misconfiguring something. Is there anything else I can try? Since we're discussing server CPUs, I'm not sure what to expect from search results. So I'm hoping you can offer some advice.
My main goal is to maximize performance per watt. If this isn't the right forum, let me know. There are many helpful discussions online, but I'm not sure where to start. Undecided

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Tuetme
Senior Member
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418
12-31-2021, 12:09 PM
#2
Undervolting might lead to certain programs not receiving sufficient voltage, wouldn't you think? Additionally, these processors are already optimized for maximum efficiency, so even minor adjustments could lead to complications.
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Tuetme
12-31-2021, 12:09 PM #2

Undervolting might lead to certain programs not receiving sufficient voltage, wouldn't you think? Additionally, these processors are already optimized for maximum efficiency, so even minor adjustments could lead to complications.

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sda1
Junior Member
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11
01-06-2022, 07:48 PM
#3
I am not inquiring about whether I should adjust my EPYC cpus, but rather if there are any possibilities to do so.
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sda1
01-06-2022, 07:48 PM #3

I am not inquiring about whether I should adjust my EPYC cpus, but rather if there are any possibilities to do so.

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Fritztech
Member
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218
01-08-2022, 08:53 AM
#4
Searching online indicates that very few, perhaps just a couple, Threadripper motherboards offer adjustments for this. A quick review of your manual shows it doesn’t appear to support such changes.
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Fritztech
01-08-2022, 08:53 AM #4

Searching online indicates that very few, perhaps just a couple, Threadripper motherboards offer adjustments for this. A quick review of your manual shows it doesn’t appear to support such changes.

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CitchoR
Junior Member
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34
01-09-2022, 12:28 AM
#5
Thank you for the clarification. I didn't need to repeat the same manual many times. I'm not trying to disable cores or significantly hurt performance. Turning off core perf boost was a good choice since the energy saved was much greater than the performance drop, and I was hoping for another way to improve efficiency. Also, according to what I understand, cTDP can only be reduced to 200 W, which is higher than the power usage of these CPUs without core perf boost.
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CitchoR
01-09-2022, 12:28 AM #5

Thank you for the clarification. I didn't need to repeat the same manual many times. I'm not trying to disable cores or significantly hurt performance. Turning off core perf boost was a good choice since the energy saved was much greater than the performance drop, and I was hoping for another way to improve efficiency. Also, according to what I understand, cTDP can only be reduced to 200 W, which is higher than the power usage of these CPUs without core perf boost.

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