Ok i've bought a socket 754 PC. ( Sempron 3000+ , 754 motherboard, (Sata or ATA :S) Hard drive, DDR Ram )

If i wished to upgrade to 939.... Would i just get a new motherboard and Processor. or is it likely they won't work with my Hard Drive and Ram....

I was thinking of just doing this ... so i can get a better graphics card, and a better processor for cheaper. then in the future upgrading will be easy. As there aren't many competitive bits of kit for 754 systems =/

Thanks in adance