My brother brought his GPU to me, mentioning that a lot of people are doing XT bios mod on reddit with good results, so I decided to give it a go.
Wow, first try and we broke world record on Steel nomad.
I found out that sweet spot is at -8 power limit, which caps power at around 288W. Stock at 10% PL it would go to 240-260W, so 288W is almost irrelevant for the life of GPU, as VRM temps never risen above 85C. According to hardware unboxed, it runs at 85-90C on stock anyway.
Overall combined with OC at -95mv stable, we saw around 15-20% performance increase over stock at 288W, above 20% at 340W, making it even faster than stock 9070XT.
I am very, very much impressed with this little GPU.