The AMD Athlon 64 X2 4400+ was a desktop processor with 2 cores, launched in May 2005, at an MSRP of $581. It is part of the Athlon 64 X2 lineup, using the Toledo architecture with Socket 939. Athlon 64 X2 4400+ has 1 MB of L2 cache per core and operates at 2.2 GHz. AMD is building the Athlon 64 X2 4400+ on a 90 nm production process using 233 million transistors. The multiplier is locked on Athlon 64 X2 4400+, which limits its overclocking capabilities.
With a TDP of 110 W, the Athlon 64 X2 4400+ consumes a lot of power, so good cooling is definitely 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. Inside the box you will not only find the processor, but also a Yes cooler.
The SSE4 instruction set is not supported, which can cause problems with modern games, as they require that capability.