Chalybion

Disclaimer: I have a 7540, not a 7X80, so take this with a huge grain of salt. Perhaps the same principles apply? The PL1 may be able to be increased by changing hidden BIOS variables. There should be variables for PL1 and PL2 that can be overwritten with a higher limit; you'll have to test whether the higher limit actually takes. If not, there should also be a variable called IMON slope that can be changed to a value of 80 or 90 - in essence only reporting 80-90% of the actual power draw (so a limit of 77W corresponds to actual power draw of 85-96 W). Do this at your own risk, of course - I would probably set a battery profile with a corresponding lower PL 2 / PL 1 to avoid damage to the battery from drawing too much current.

They are disabled already; my understanding is if they are enabled in W11, then all voltage register changes are locked out, even if enabled in the BIOS. People who require W11, virtualization, and undervolting have had limited success either setting the undervolt in BIOS, or writing code that applies an undervolt each boot before Windows loads.

That's unexpected - "Unlock Adjustable Voltage" was disabled in Throttlestop on BIOS 1.24 until I changed those variables. I am on Windows 11 22H2, if that makes a difference. There appear to be other BIOS variables linked to PL1 / PL2 that I will experiment with to see if they can override the 75W / 107W limit. Throttlestop lets me set values above 75/107, but the CPU will always throttle to 75/107 during a benchmark. Turbo Time Limit appears fixed too. With an undervolt, the 9980HK can sustain 4.2 GHz on all cores while consuming ~105W. I will need upgraded thermal compound to sustain that speed reliably. With more thermal headroom, I will experiment with the highest all-core speed that can be sustained.

I recently purchased a Precision 7540, and have had success tweaking the power settings of the processor using Brendan Greenley's guide: Undervolting 2020 Dell Laptops For anyone interested I've attached the BIOS dump from v1.24. I'm currently on BIOS v1.26.1, and can confirm that the same settings work. In the GRUB terminal, the relevant commands are (the forum software changes all "x'es" to multiplication signs - not sure how to fix this?): Overclocking Lock: setup_var Setup 0x789 0x1 CFG Lock: setup_var Setup 0x6ed 0x1 Overclocking Feature: setup_var Setup 0x856 0x1 With these changes, I was able to achieve a stable undervolt of -120 mV cache and -150 mV core on my i9-9980HK using Throttlestop. On stock cooling, the Cinebench R20 multicore score increased from 3550 to 4060. However, Dell has appeared to limit the power limits to 75W for PL1, and 107W for PL2. Changes in Throttlestop beyond these limits do not take. That's when I found this article about the ability of IMON Slope to effectively increase power limits by reporting only a percentage of the power draw to the controller: [GUIDE] Unlock the EC TDP limit of your low power U series Intel CPU The Precision 7540 BIOS does have four IMON Slope variables, which are normally set to 0x0 (disabled / power reported = actual power). On the stock cooling, the processor already reaches thermal limits at 107W, but I wanted to increase the PL1 to improve sustained performance. I was able to successfully change the IMON Slope to 90, making the effective PL1 (75W / 0.9) = 83W. I also reduced the PL2 to 96W to maintain the same effective power limit. Here are the changes I made: setup_var Setup 0x8ac 0x5A setup_var Setup 0x8ae 0x5A setup_var Setup 0x8b2 0x5A setup_var Setup 0x8b4 0x5A As a result, the processor sustained ~3850 mhz on all cores at 90-92 °C at PL1, resulting in a Cinebench R20 multicore score of 4279! I have plans to upgrade the cooling solution by re-pasting with PTM7950, replacing thermal pads, and doing the Delta fan mod mentioned elsewhere in this thread. I have all the parts, but lack time - so I will report the improvements in a couple of months, after complete. File_DXE_driver_Setup IFR.txt