Celeron 400 series family was the first family of low-cost desktop CPUs based on Core micro-architecture. The 400 series processors include basic features of the Core microarchitecture - 64-bit processing, Execute Disable bit, enhanced branch prediction, support for SSE3 and Supplemental SSE3, quad-pumped Front-side Bus, and others. As usual for all budget processors, these Celerons do not include as many features, or have inferior features as compared to desktop high-performance CPUs. The Celeron 400 series include only single CPU core, small 512 KB level 2 cache, and they do not have Enhanced SpeedStep technology.