Phenom II X2 550 is a desktop processor from AMD released on 4 November 2009, and it is in end-of-life production status now. It belongs to Phenom II X2 family and has a Callisto architecture. This processor is built on AMD Socket AM3, and uses Gen 2 PCI express connection. 45 nm process is used in production.
Processor has 2 cores and 2 threads, with the base frequency of 3.1 GHz. It has DDR3 Dual-channel memory support. As for the cache, it supports L1 128K (per core), L2 512K (per core) and L3 6MB (shared).