I don't think anyone has tried it with the founders yet as normally 3x8 pin card bios wont work with a 2x8 pin. This time around the fe is the card with the highest power limit for a 2 x 8 pin, so not much drive to try out other bios. Also the pcb is custom. So this may mean a stop.
However, there is a small hope. Last gen the evga xoc 3 pin bios worked on the 2x8 pin founders. They have just released a 500w beta version, so maybe someone will try this out soon.
Ah ok yeah makes sense, will be interesting to see if anyone trys it... certainly wont be me though heh.