check if the bios revision allows for the am3 cpu.. if it does then yes.. also check the tdp of the cpu and the tdp of the motherboard..
(sounds like a stupid response but the motherboard manufacturer has to enable am3 compatability before am3 cpus work on am2+ sockets. am3 will not work on am2, but on am2+ and am3 sockets.. you need to update bios before you put in your am3 cpu btw)