I recently upgraded to Windows 11 and now find that no matter what I set the "Processor Core IccMax" value to in XTU, Current/EDP throttling is never applied (in XTU, the throttling label never says "Yes", even if I set the limit to silly numbers like 1A).
This worked perfectly in Windows 10.
Using XTU 220.127.116.11 on Lenovo P53 (model 20QQS9G81Z, CPU i9-9880H).
I installed latest power management drivers from Lenovo website - no success.
My goal is to avoid thermal throttling (which is very bad on this PC) and use current throttling instead (which produces a far smoother experience).
You should be aware that your processor is not supported by XTU. XTU only supports X and K processors.
Doc (not an Intel employee or contractor)
[Windows 11 is the new Vista]