Your motherboard has an AM2+ socket, the Athlon II x2 260 has an AM3 socket. It should work, but I doubt this upgrade is worth it.
-AM3 processors work on AM2+ motherboards due to the presence of both the DDR2 and DDR3 memory controllers on the processor
-AM2+ processors do not work on AM3 motherboards due to the processor's lack of a DDR3 memory controller
Source;http://en.wikipedia.org/wiki/Socket_AM2%2B