The cheaper Socket 939 Processor is the Athlon 64 3000+ (The Socket 939 version, obiously ). There are rumors that AMD will make a Sempron 3200+ for Socket 939 but the last information about it was that it will be available as an OEM version only (For example, the Athlon 64 3300+ that some Hewell Packet computers got). Don't waste your time and go with that Athlon 64 that is already quite cheap and fast, and I suggest you wait until the Athlon 64 FX-57 (San Diego Core probabily) or a Dual Core Processor before upgrade again.