A few days ago, I posted that I was going to flash the vBios of the Reaper 9070 XT on my 9070 Hellhound. I researched their PCBs and, at first glance, they appear to be identical.
I looked into the configuration specifications, and the power phases have a capacity limit of 400A. In my Rx 9070 Hellhound, that would be equivalent to about 340W at 1V.
I tried a TDP of 280W to start with (-10 Pw limit), with an undervolt of -100mv and in Steel Nomad, the core of my GPU used between 820-850mv at full load. I didn't take a screenshot, but I reached a score of 6600 in Steel Nomad, my record with the stock BIOS was 6500.
If we do the math, at a power of 280W with a core at 820mv, the phases would have to withstand 342A. If we take that to the 304W base of the XT BIOS, the amperage they would have to withstand would be 370A, which is already entering dangerous territory in the long term, exceeding 70-80% of their maximum capacity, which can end up putting too much stress on the phases.
I'm not sure about the reliability of using the power phases so aggressively. The Reaper XT has the same number of phases (8 for the GPU core), but I don't know the amperage of each one, whether each is 50A or 60A.
Can anyone with more knowledge recommend what to do? I reflashed the original vBios as a precaution, but it shouldn't necessarily be a problem.