Need help with undervolt/clock

[Zilacon]

Hello, new here, figured this would be the best place to ask.

I built a few mini itx systems im going to be using for servers, however the idle and max power draw is very high, much higher then i thought it would be with my parts selection.
Here is the setup:
- AMD Ryzen 7 3800X
- Aorus/Gigabyte B550I AX Mini ITX Board
- 64GB (2x32GB) G.Skill Ripjaws 3600Mhz RAM
- Aorus/Gigabyte 2TB NVME SSD
- Zotac GT 710 2GB PCIE 1x GPU
- Corsair SFX 450w PSU
- Fractal Design Node 202 Case

Now on idle its around 45-50w and on load it can go up to 140w
I was hoping to get around 15-20w idle and 65w full load. I dont care if i lose performance to achieve this power draw.
I was using AMD FX 8150 CPU's to host servers before upgrading, so i doubt any amount of performance loss would amount going back to a AMD FX cpus level on a 3800X.
Wanting a very low power draw is mainly to prolong the duration my APC UPS units can keep the servers powered in a outage.
So what settings do i edit in the BIOS to achieve this? I heard of editing the PBO to reduce the power draw but ive never done that before so would like a detailed summary of how to do that.

Thanks to anyone who can guide me on doing this.

[PDifolco]

Just set PPT in BIOS to custom /65W, tho you'll gimp the CPU seriously but it should work

Disable PBO, also you can try Curve Optimizer, all cores -15 to keep things simple, won't make the power draw less but cores will clock a tad faster 

[Zilacon]

Would there be much of a difference if i upgraded to a 5700G and got rid of the GPU in power draw?
And thanks for the quick reply, what is PPT? Still kind of new to ryzen.

[PDifolco]

14 minutes ago, Zilacon said:

Would there be much of a difference if i upgraded to a 5700G and got rid of the GPU in power draw?
And thanks for the quick reply, what is PPT? Still kind of new to ryzen.

PPT = package Power Tracking, sets the max power draw for the CPU, is 140W default on 3800X

On second though 65W may be really low and famishes your CPU, maybe around 100W would be wiser

It's usually modifiable under "Overclocking/Tweaking" section of BIOS, but details depend on the board BIOS software

 

Getting a 5700G is rather a sidegrade, you'll get 6 faster cores to 8 ... If really you're on low draw and have a GPU get a cheaper 5600 (non G non X)

[KaitouX]

1 hour ago, PDifolco said:

Just set PPT in BIOS to custom /65W, tho you'll gimp the CPU seriously but it should work

Disable PBO, also you can try Curve Optimizer, all cores -15 to keep things simple, won't make the power draw less but cores will clock a tad faster 

It might not gimp the CPU that much, considering that the 3700X is set at 88W. Also some people have posted tests of limiting the 3700X to 65W and losing ~10% performance on what seems to be average launch chips, on more recent chips or golden samples you might be able to get away with losing something like ~5% or so.

But only changing the PPT won't affect the idle power consumption, i think you would need to apply a negative offset to the vcore to get lower idle power consumption.

 

The 5700G power consumption at idle is about the same as the 3800X, so the difference would depend on how much power the GPU uses at idle. Check HWInfo to see the GPU power consumption at idle.

1 hour ago, PDifolco said:

Getting a 5700G is rather a sidegrade, you'll get 6 faster cores to 8 ... If really you're on low draw and have a GPU get a cheaper 5600 (non G non X)

The 5700G is the 8-core part, i think you're confusing it with the 5600G.

[PDifolco]

1 hour ago, KaitouX said:

It might not gimp the CPU that much, considering that the 3700X is set at 88W. Also some people have posted tests of limiting the 3700X to 65W and losing ~10% performance on what seems to be average launch chips, on more recent chips or golden samples you might be able to get away with losing something like ~5% or so.

But only changing the PPT won't affect the idle power consumption, i think you would need to apply a negative offset to the vcore to get lower idle power consumption.

 

The 5700G power consumption at idle is about the same as the 3800X, so the difference would depend on how much power the GPU uses at idle. Check HWInfo to see the GPU power consumption at idle.

The 5700G is the 8-core part, i think you're confusing it with the 5600G.

Indeed my bad about the 5700G I had the 5600G in mind!

But anyway it won't be much better vs a 3700X at 65W...