AMD is preparing to launch a new high-end desktop processor, the Athlon 64 X2 6400+, which will be the last processor in the Athlon 64 X2 family, according to sources at motherboard makers. Currently, AMD's highest-end desktop processor is the Athlon 64 X2 6000+, however with its performance unable to match Intel's upcoming Core 2 Duo E6850, AMD plans to launch the new 6400+ to cover up the gap in the market, noted the sources.