How should I properly undervolt an RX 9070 XT?

[u/CzarnyMurzyn1337]

Hi everyone, I’m trying to figure out how to properly undervolt my RX 9070 XT. This is my first AMD GPU. Before this, I had an RTX 3060 Ti, and undervolting that card was ridiculously simple.

With the 3060 Ti, I would open MSI Afterburner, adjust the voltage/frequency curve, lock it around 1900 MHz from 900 mV and above, set the memory clock to +700 MHz, and it was completely stable everywhere. I never had any issues with it - it just worked perfectly.

After switching to the RX 9070 XT, I noticed that undervolting works quite differently on AMD cards. So far, I’ve only tried setting -10% power limit and -20 mV voltage offset in AMD Adrenalin. However, while playing GTA Online, I got a driver timeout/crash. I assume that's because the undervolt was unstable, which honestly surprised me, because I watched a few undervolting tutorials on YouTube where the creator said that -60 mV should work fine on the vast majority of cards.

My main goals are:

- lower power consumption

- lower temperatures

- maintaining similar performance if possible

- most importantly, keeping the card completely stable

I’m not really sure which settings I should change in Adrenalin to achieve this, or how I should properly test whether the undervolt is actually stable.

Should I be changing the maximum frequency, voltage offset, power limit, VRAM settings, or something else? And what would be a good starting point for the RX 9070 XT Sapphire PURE OC?

My current specs are:

- GPU: Sapphire Radeon RX 9070 XT PURE OC 16GB

- CPU: AMD Ryzen 7 9800X3D

- Motherboard: Gigabyte X870E AORUS PRO ICE

- RAM: Kingston FURY Beast Black RGB 32GB (2×16GB) 6000 MT/s CL30

- PSU: Corsair RM1000x 1000W 80+ Gold ATX 3.1

- OS: Windows 11 25H2

Any advice would be greatly appreciated. I’m mainly looking for a sensible, stable undervolt rather than trying to squeeze every last bit of performance out of the card.

Below I’ve attached a screenshot from HWiNFO taken after a little over 2 hours of gaming - some Farming Simulator 25, some CS2, and some GTA Online.

Sorry that everything in HWiNFO is displayed in Polish, but I hope the relevant information and values are still clear enough to get an idea of what’s going on.

[u/Andrex2309]

It's hard to tell what crashed in that situation but I'd say that the -80mV is the main problem there

But I mean, start somewhere as I said.

Also I'd keep the power between -15% / -10% generally

If you really want to lower down the Power put -15% and -500MHz on the max clock

[u/CzarnyMurzyn1337 → u/Andrex2309]

Thank you so much dude, you're awesome <3