Hi All,

I have 12 * Saphire RX570 Nitro+ 8GB OC cards split across 2 rigs running Linux and have copied the memory straps, amended the default core and gpu speeds and so the first part is fine as the cards are giving me an average of 24.8Mhs using the config 1281/2150.

However, when it comes to undervolting, I've tried using SRBPolaris to do this by setting the voltage at 850 however after saving the rom and flashing, after a reboot of windows the card is still drawing 147w.  If I then manually undervolt in Trixx by -150 then the draw comes down to 114w which is much more acceptable.

As my rigs are running Linux I need to undervolt via bios mods hence the plea for help as I'm obviously doing something wrong, I just don't know what.

I've read lots of references to having to HEX edit the bios to do this, if this is the only option, can someone point me to an article that will educate me in how to do this (safely) as I thought that either PBE or SRBPolaris were writing the necessary changes to the .rom file and therefore not clear on what the HEX editing will do that these utils are not?

Apologies for the noob questions, this is my first setup and am very eager to learn!

Cheers