New
#11
this is a store bought, pre-built computer? just guessing, but it maybe there is a chipset limitation for your board.
i'm running an am2+ phenom II x4 940 -- processor subscore in wei is 7.3. but, this is a pc i put together and there are many settings in the bios that pertain to cpu adjustment that a branded computer such as yours may not possess. (with mine, however, i did not have to make any changes in the bios that pertain to cpu.)
again, just a guess.
and... just checked the specs on your machine... it came with an athlon 64X2, which is am2/am2+ and you dropped an am3 processor in the machine. though the am3 socket is backward compatible with am2+, you may not see all of the benefits of that 955 processor when it is running in an am2+ socket.