Also, read until it's clear how or if you should proceed. I'm not sure if it is ok to download a modded bios, or you are supposed to extract and submit your own, or something else. It is at one's own risk. I do not have R9-290 cards, so I didn't follow the thread.
Thanks for the link. My 290x is a reference design, so perhaps it could be due to the memory manufacturer. I'll give the BIOS a shot.