Hey there!
Im sharing good news! The brand new GV-R685OC-1GD - HD6850 from Gigabyte
runs perfect with my 2007 Abit AN-M2 with the latest official bios relase.
There is no more multiple boot up problems like in HD5xxx series (i have before HD5770...)
GV-N430-1GI (rev. 2.0) - GT 430 runs smooth with no problems too.
Best regards to Abit community!