The AMD Athlon 64 4000+ was a desktop processor with 1 core, launched in May 2005, at an MSRP of $375. It is part of the Athlon 64 lineup, using the Toledo architecture with Socket 939. Athlon 64 4000+ has 1 MB of L2 cache and operates at 2.4 GHz. AMD is making the Athlon 64 4000+ on a 90 nm production node using 233 million transistors. The multiplier is locked on Athlon 64 4000+, which limits its overclocking potential.
With a TDP of 89 W, the Athlon 64 4000+ consumes a good deal of power, so decent cooling is needed. AMD's processor supports DDR1 memory with a dual-channel interface. The highest officially supported memory speed is 400 MT/s, but with overclocking (and the right memory modules) you can go even higher. Although the processor doesn't come with integrated graphics, certain motherboards with compatible chipsets can provide this capability.
The SSE4 instruction set is not supported, which can cause problems with modern games, as they require that capability.