Undervolting CPU and GPU

[Winterlight]

Currently I have 5900X + 4070 Ti and while game this system use a lot power ~400W and that not even full load.

How I can undervolt CPU ? I want reduce voltage and it's clokc limit max to ~4 Ghz becosue that ~500 Mhz won't make massive diference in games but can save a lot power.

Currently CPU with PBO2 undervolt still run at 1,44V and can hit ~4,7 Ghz

I don't have knowdalge and I don't want burn CPU any easy way reduce voltage for example to ~1,2V and set max clock to 4,2 Ghz it shoudl be stable due from what I seen under full load CPU run at 1,2V by default and hit 4,2 Ghz on all core. It go 1,44V by default only at single core intensive task.

Same with GPU any easy way reduce it's voltage and clock that not make huge preformance impact but save power ?

Btw I don't want use MSI Afterburner for GPU undervolting. I don't trust that software anymore.

I could use Asus GPU Tweak but from what I understand it same software just skin diference.

[merch22]

Personally.

 

CPU side, I have the clock fixed at 4.2G with -0.225V offset in BIOS. i'm getting 90%+ performance with 60-70% power consumption.

it's really too aggressive to let AMD manage power automatically.CPU temperatures are at least 5 degrees cooler, in light use situations.

GPU side, In the case of the 40 series, I think it is possible to apply a power limit on the NVIDIA control software, 80% is a good point assuming you don't sacrifice a lot of performance.

But in general, MSI Afterburner for GPU undervolting gives better results and VRAM overclocking in a way offsets the performance loss due to lower GPU clock.

 

I'm just playing around with it because I personally don't like fan noise, but I'm not an expert,  so please don't take it seriously.

[WereCat]

Why no Afterburner? 

[Winterlight]

25 minutes ago, merch22 said:

Personally.

 

CPU side, I have the clock fixed at 4.2G with -0.225V offset in BIOS. i'm getting 90%+ performance with 60-70% power consumption.

But what settings I need change actually in BIOS without burn somthing ?

I tried look YouTube but no one do manually undervolt or overclock everyone just use PBO2 that is not good.

It hard find video there explain what settings need change for manually undervolt.

[leclod]

For the gpu, a basic tutorial using msi afterburner (I use an Intel cpu so no cpu undervolting tuto)

Edited August 24, 2023 by leclod

[merch22]

17 minutes ago, Winterlight said:

But what settings I need change actually in BIOS without burn somthing ?

I tried look YouTube but no one do manually undervolt or overclock everyone just use PBO2 that is not good.

It hard find video there explain what settings need change for manually undervolt.

 I think I see a video on TechYesCity in old days.  

I don't really know PBO2, it may be evolving.

I think the point of TechYesCity was that the system runs more smoothly with less clock fluctuations if you do it manually than if you let the software manage it.

As for the BIOS, I think all I had to do was disable the manufacturer's automatic overclocking, put a negative offset in the power and manually put a digit in the CPU clock multiplier.

Theoretically nothing will break, but be prepared for clear CMOS.

[Winterlight]

51 minutes ago, WereCat said:

Why no Afterburner? 

Due security reason.

[Winterlight]

Ok I can't change at all CPU Core ration in BIOS is set as auto and not allow change me that.