The Intel Atom Z550 was a mobile processor with 1 core, launched in April 2009. It is part of the Atom lineup, using the Silverthorne architecture with BGA 441. Thanks to Intel Hyper-Threading the core-count is effectively doubled, to 2 threads. Atom Z550 has 512 KB of L2 cache per core and operates at 2000 MHz. Intel is making the Atom Z550 on a 45 nm production node using 47 million transistors. The multiplier is locked on Atom Z550, which limits its overclocking potential.
With a TDP of 2 W, the Atom Z550 consumes extremely little energy.
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 Atom Z550, which greatly improves virtual machine performance.