Sapphire 7970 different bios

[dave_atl]

I've got several Sapphire 7970 OC w/boost, and one of them seems to have a different bios. Most say they have version 015.025.000.099.000000 (113-2104XTHY-OB5), but one of them has 015.025.000.099.000000 (113-2104XTHY-OB6)... same major version, just the header is slightly different. Online, I can only find the OB5 version and I'm having trouble getting the OB6 card to play nice with the OB5 cards. I'm wondering if I should flash the OB6 bios to OB5, any thoughts?