3 ms·

> my i7-8650U those can but 10nm CPUs after Plundervolt can't undervolt , it's disabled from UEFI and not only there's no option to reenable it in the UI, the

by chx 2y ago

> my i7-8650U those can but 10nm CPUs after Plundervolt can't undervolt , it's disabled from UEFI and not only there's no option to reenable it in the UI, the very EFI variable itself is write locked. I have an X1 Gen 4 (Intel 11th gen) and you just can't do it.

lm411 2y ago
Damn, you mean we can't just swap resistors to under/over volt anymore? I am getting old. (tongue in cheek, and yes, I am getting old) Shit, I remember just using a pencil to lower resistance values.
- ngneer 2y ago
  You can. The main thing is that software-based attacks are easier to perform.
  - chx 2y ago
    That'd be reason to take away the reenable from UEFI but write protecting the EFI variable where changing it already requires to boot into an EFI editor is just being dicks, pardon my French. Just let me enable it , I am aware of the risks.
    - ngneer 2y ago
      I think the trouble is that it is not possible to distinguish (through reliable technical means) a responsible overclocker such as yourself versus an unscrupulous actor editing EFI variables in flash. So, because some bad guys/gals found a way to damage the system, all the good guys/gals suffer as a result, because the system cannot tell them apart. Reminds me of airport security...
- Scoundreller 2y ago
  I remember some boards, you would have to paint a cpu pin with nail polish to stop it from conducting, or carefully jump one of the several hundred pins on the socket…
bytehowl 2y ago
On my Lenovo Legion 5 Pro with i7-13700HX I can disable undervolting protection in stock UEFI. The only problem is that Windows virtualization features get disabled when undervolting is allowed, and I kind of need those.
- chx 2y ago
  That's good news, then they reenabled it after three generations of it being disabled.
  - hmm37 2y ago
    Perhaps it's just your laptop manufacturer. But people were able to undervolt on gen 11 by editing the EFI variables and then turning off virtualization. https://old.reddit.com/r/AcerNitro/comments/qvznen/unlock_undervolting_on_11th_gen_h45_nitro_5/ https://old.reddit.com/r/AcerNitro/comments/qvznen/unlock_un...
hmm37 2y ago
Many times you can still edit the EFI variable that has been disabled. https://brendangreenley.com/undervolting-2020-dell-laptops-like-the-vostro-7500-and-more-tips-to-improve-thermals-battery-life-and-speed/ https://brendangreenley.com/undervolting-2020-dell-laptops-l...
- chx 2y ago
  Nope, you can't read please > for the Comet Lake 10750H processor That's not 10nm that's just Skylake+++++++++++
hu3 2y ago
Not trivial but some folks (including me) HEX edit a bit or two from UFEI/Bios to reenable undervolting.
- chx 2y ago
  The laptop BIOS is signed. I am not exactly unfamiliar with a hex editor but really: you can't.
  - hu3 2y ago
    You can disable secure boot. Then edit firmware. So yes, you can. I did.

by chx 2y ago

lm411 2y ago

Damn, you mean we can't just swap resistors to under/over volt anymore? I am getting old. (tongue in cheek, and yes, I am getting old) Shit, I remember just using a pencil to lower resistance values.

ngneer 2y ago
You can. The main thing is that software-based attacks are easier to perform.
- chx 2y ago
  That'd be reason to take away the reenable from UEFI but write protecting the EFI variable where changing it already requires to boot into an EFI editor is just being dicks, pardon my French. Just let me enable it , I am aware of the risks.
  - ngneer 2y ago
    I think the trouble is that it is not possible to distinguish (through reliable technical means) a responsible overclocker such as yourself versus an unscrupulous actor editing EFI variables in flash. So, because some bad guys/gals found a way to damage the system, all the good guys/gals suffer as a result, because the system cannot tell them apart. Reminds me of airport security...
Scoundreller 2y ago
I remember some boards, you would have to paint a cpu pin with nail polish to stop it from conducting, or carefully jump one of the several hundred pins on the socket…

bytehowl 2y ago

On my Lenovo Legion 5 Pro with i7-13700HX I can disable undervolting protection in stock UEFI. The only problem is that Windows virtualization features get disabled when undervolting is allowed, and I kind of need those.

chx 2y ago
That's good news, then they reenabled it after three generations of it being disabled.
- hmm37 2y ago
  Perhaps it's just your laptop manufacturer. But people were able to undervolt on gen 11 by editing the EFI variables and then turning off virtualization. https://old.reddit.com/r/AcerNitro/comments/qvznen/unlock_undervolting_on_11th_gen_h45_nitro_5/ https://old.reddit.com/r/AcerNitro/comments/qvznen/unlock_un...

hmm37 2y ago

Many times you can still edit the EFI variable that has been disabled. https://brendangreenley.com/undervolting-2020-dell-laptops-like-the-vostro-7500-and-more-tips-to-improve-thermals-battery-life-and-speed/ https://brendangreenley.com/undervolting-2020-dell-laptops-l...

chx 2y ago
Nope, you can't read please > for the Comet Lake 10750H processor That's not 10nm that's just Skylake+++++++++++

hu3 2y ago

Not trivial but some folks (including me) HEX edit a bit or two from UFEI/Bios to reenable undervolting.

chx 2y ago
The laptop BIOS is signed. I am not exactly unfamiliar with a hex editor but really: you can't.
- hu3 2y ago
  You can disable secure boot. Then edit firmware. So yes, you can. I did.