Help with Aurora R3 Configuration

I have an Aurora R3 from 2012.  The only change I have made is added another hard drive.  My bios is A05.  I can't tell what power supply I have, the configuration look up says "Part KC1WV - Module, Chasis, Standard, MBK, 875, Aur 3".  

Two questions.  Is my power 875w, if not how can I tell?  Do I need to update bios to upgrade GPU, currently AMD 6870.  The driver download says the bios update is A11.  I thought I read somewhere on this forum that you need to do an update to A07 before going to A11.  

Thanks for any direction you can offer.