Based on it's specifications and information on newegg it should handle the Phenom II 955 along with other AM3 processors, however I went to foxconn's website and it doesn't list support for the 945 or 955, but it does for the rest of the Phenom II line up. You shouldn't have any problems, the support list is just probably out of date, but if you want to be safe contact foxconn and ask them.
Actually, performance gain is really minimal when using ddr3 over ddr2 right now. The real gain happens when you hit the 2000 Mhz mark and aside from servers, I dont believe you are going to get the gains you think you will. This board should be sufficient to run most of the everday tasks aand programs a normal to moderate user should use. It would be a good buy.