Hi guys.
More than a year ago I did a guide for undervolting Nvidia RTX cards in my native language.
Today I've made an English version of it. It's "proven in battle" also the undervolting is made on every point of the curve, so when you do anything with your GPU it will stay undervolted.
Many people don't do undervolting on lower frequencies and mostly – they do OVERVOLTING there… meaning your card in that scenario absorbs more power than on factory settings.
There is also a quick guide for overclocking core and VRAM.
Take a look. If you have any questions I'll try to help you:
https://www.techpowerup.com/forums/threads/guide-plain-and-simple-nvidia-rtx-5000-series-undervolting-method-by-lame.351599/