AMD Athlon 64: AMD Athlon 64 processors are 64-bit microprocessors based on K8 architecture and designed for desktop computers. These microprocessors include all basic features of K8 micro-architecture, such as split 128 KB level 1 cache, exclusive 512 KB or 1 MB level 2 cache, AMD64 technology, Enhanced Virus Protection, and support for SSE2 instructions. These processors are powerful and affordable and fit the socket 939.