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Undervolting to lower CPU temps...

vliktor
By vliktor
in Troubleshooting
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Posted

In relation to this past topic:

 

 

... I've already updated the case to a Lian Li Lancool 215x, and I got what I think is an overkill of a cooler, the Noctua NH-D15.Chromax.black. I also managed to apply XMP but keep the RAM at a 32.00 multiplier. Everything else though is the same.

 

I've noticed a reduction of max temps during Cinebench of up to 5C, but it's still too hot in my opinion, as it's stuck at a maximum of 84C. So I looked into undervolting through Ryzen Master (1.275v peak voltage), and saw a massive decrease in temps of up to 10C (maxing out now at 75C on CBR20). Now I want this to be applied to the UEFI so it sticks, and I'm not sure which switch to flip:

 

  • Is it VCORE SOC?
  • Or CPU VDD18?
  • Or A_VDD18SS?
     

GIGABYTE-B550-Aorus-Elite-UEFI-BIOS-4.jp

Ryzen 5 3600 + CoolerMaster Hyper 212 LED Turbo | Gigabyte Aorus Elite B550 | G.Skill Trident-Z (2x8) DDR4-2133 | MSI GTX 1060 Gaming-X 6 GB | NZXT Phantom 410 | SilverStone 650W 80+ Bronze non-modular | Intel SSD 535 (240 GB) SSD - Kingston UV400 (480 GB) SSD - Sandisk SSD Plus (1 TB) SSD - Western Digital Caviar Blue (1 TB) HDD
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55 minutes ago, vliktor said:

I'm not sure which switch to flip:

This should help.

https://sff.life/how-to-undervolt-ryzen-cpu/

CPU Vcore offset

If I remember I think I did -0.102 or close to that, but do not expect the same result.

Also, sometimes windows does not start up if the voltage is too low or you may have other issues with stability.

The link should help.

And you are doing this at your own risk.

Gaming With a 4:3 CRT

System specs below

 

CPU: AMD Ryzen 7 5700X with a Noctua NH-U9S cooler 
Motherboard: Gigabyte B450 Aorus M (Because it was cheap)
RAM: 32GB (4 x 8GB) Corsair Vengance LPX 3200Mhz CL16
GPU: EVGA GTX 980 Ti SC Blower Card
HDD: 7200RPM TOSHIBA DT01ACA100 1TB, External HDD: 5400RPM 2TB WD My Passport
SSD: 1tb Samsung 970 evo m.2 nvme
PSU: Corsair CX650M
Displays: ViewSonic VA2012WB LCD 1680x1050p @ 75Hz
Gateway VX920 CRT: 1920x1440@65Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@125Hz
Gateway VX900 CRT: 1920x1440@64Hz, 1600x1200@75Hz, 1200x900@100Hz, 960x720@120Hz (Can be pushed to 175Hz)
 
Keyboard: Thermaltake eSPORTS MEKA PRO with Cherry MX Red switches
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Posted
  • Author
On 1/29/2021 at 10:21 AM, MadAnt250 said:

This should help.

https://sff.life/how-to-undervolt-ryzen-cpu/

CPU Vcore offset

If I remember I think I did -0.102 or close to that, but do not expect the same result.

Also, sometimes windows does not start up if the voltage is too low or you may have other issues with stability.

The link should help.

And you are doing this at your own risk.

Risk? I thought the risk was with overvolting, not undervolting.

Ryzen 5 3600 + CoolerMaster Hyper 212 LED Turbo | Gigabyte Aorus Elite B550 | G.Skill Trident-Z (2x8) DDR4-2133 | MSI GTX 1060 Gaming-X 6 GB | NZXT Phantom 410 | SilverStone 650W 80+ Bronze non-modular | Intel SSD 535 (240 GB) SSD - Kingston UV400 (480 GB) SSD - Sandisk SSD Plus (1 TB) SSD - Western Digital Caviar Blue (1 TB) HDD
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2 minutes ago, vliktor said:

Risk? I thought the risk was with overvolting, not undervolting.

If you undervolt too far, your computer becomes unstable or crashes under load, or doesn't boot. Then you have to clear CMOS. It could appear stable on normal loads, you install a more demanding game down the line and start getting crashes.

I'm not actually trying to be as grumpy as it seems.

I will find your mentions of Ikea or Gnome and I will /s post. 

Project Hot Box

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Why is the 5800x so hot?

 

 

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OK, so the risk is just with the UEFI and the need to do a CMOS reset, not actual hardware damage.

 

I just want to do an undervolt (set max CPU voltage), don't want to mess with PPT or PBO. It was easy to just do max CPU voltage in Ryzen Master, and I could immediately see the lower temps. With the UEFI, it's a bit confusing:

  • Is it VCORE SOC?
  • Or CPU VDD18?
  • Or A_VDD18SS?
Ryzen 5 3600 + CoolerMaster Hyper 212 LED Turbo | Gigabyte Aorus Elite B550 | G.Skill Trident-Z (2x8) DDR4-2133 | MSI GTX 1060 Gaming-X 6 GB | NZXT Phantom 410 | SilverStone 650W 80+ Bronze non-modular | Intel SSD 535 (240 GB) SSD - Kingston UV400 (480 GB) SSD - Sandisk SSD Plus (1 TB) SSD - Western Digital Caviar Blue (1 TB) HDD
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