The AMD Athlon 64 X2 4000+ was a desktop processor with 2 cores, launched in May 2006. It is part of the Athlon 64 X2 lineup, using the Windsor architecture with Socket AM2. Athlon 64 X2 4000+ has 1 MB of L2 cache and operates at 2000 MHz. AMD is making the Athlon 64 X2 4000+ on a 90 nm production node using 154 million transistors. The multiplier is locked on Athlon 64 X2 4000+, which limits its overclocking potential.
With a TDP of 89 W, the Athlon 64 X2 4000+ consumes a good deal of power, so decent cooling is needed. For communication with other components in the system, Athlon 64 X2 4000+ uses a PCI-Express Gen 2 connection. 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. Hardware virtualization is available on the Athlon 64 X2 4000+, which greatly improves virtual machine performance.