I was never able to flash another bios on the reference 290X 8GB cards. It was either me doing something wrong, or Sapphire locked both bios. It's more likely the former, but when i tried i wasn't able to flash.
Damn, was going to try the sapphire vapor-x 8GB onto it but wont bother then.
is there any benefit from using the uber mode when watercooled?