Originally Posted by KedarWolf
My Corsair AX1500i can log the power going to each pci-e power connector. I have separate cables on my six and eight pin, doing that now.
Also great news - at least that way you can try with each BIOS and have a before/after comparison.
I actually am downgrading my previous dire warning to a gentle 'caution' - I took a closer look at the datasheet for the uP9511p phase controller that Nvidia used on the FE cards, and it doesn't look like it supports any sort of modification of phase balancing in software - all of the current limits and sensing are all programmed physically with resistors on the board.
AMD had this capability with the controller they used on their RX480 boards and were able to have it draw less power from the motherboard slot with a BIOS flash, which is why I was a little worried.
My only other worry was that perhaps they changed the current sense resistors from the FE to the Strix board, but I double checked and both boards use 5 milliohm resistors to sense the current for all 3 power sources, so we're good there too.