I have a am2 gigaybte m61p-s3 motherboard currently with a athlon 64 x2 6400+, it runs hot and stuff and i can get a phenom II x2 555 for like $40 with a after market cooler, and i checked on the gigabyte website and there is a bios update to take certain am3 cpus including phenom II quad cores and dual cores and ones with same tdp etc but the 555 says N/A, so would it not work or is it just an incomplete list?