Hi amd sifus, I have question to ask

AMD Socket AM3+ Processor ( Phenom Series )
AMD Phenom II X4 AM3 Z955 Black Edition RM375

this is what I saw from garage sales thread. Im planning to upgrade from athlon IIx2 to phenom II x4 955be but now I got confused by the "z" and also the socket type. this 1 is am3 or am3+ because my mobo is old 1, msi 770-c45 only support am3.

another question is, do I need to update bios to the latest for this processor to work?

this is what I found on msi website

Phenom II X4 Deneb HDX955FBK4DGI x955 200 3.20 2M 6M C2 125 7599v13.zip
Phenom II X4 Deneb HDX955FBK4DGM x955 200 3.20 2M 6M C3 125 7599v14.zip
Phenom II X4 Deneb HDX955WFK4DGM x955 200 3.20 2M 6M C3 95 7599v16.zip
Phenom II X4 Deneb HDX960WFK4DGM x960 200 3.30 2M 6M C3 95 7599v1E.zip
Phenom II X4 Deneb HDZ955FBK4DGI z955 200 3.20 2M 6M C2 125 7599v10.zip
Phenom II X4 Deneb HDZ955FBK4DGM z955 200 3.20 2M 6M C3 125 7599v14.zip

my current bios is 1.3

thanks in advance

ok then, thanks for the answer

which cpu's price did he reduced? curious to know