You are reading WAAAAAY too much into the feedback about updating the BIOS. The BIOS flashing thing is unique to the specific XFX card you linked. Some people feel that the default fan profile was too high and caused the card to make more noise than they wanted it to so they flashed a different BIOS to lower it. NO video card "requires" you to flash its BIOS, not the HD6870, not the HD6850 and not even the specific card you linked. It is something some people chose to do to lower noise levels on that one card.