Intel Celeron M 500 series microprocessor

This Celeron M 520 has many key features, such as frequency, FSB, size of level 1 and 2 caches, and support for SIMD instructions, similar to those of the Celeron M 420. The advantages of this CPU over the 420 is a newer micro-architecture, and support for 64-bit and supplemental SSE3 instructions. It's easy to see how more efficient is Core micro-architecture by comparing the 420 and 520 processors on the same motherboard, using fairly old applications on 32-bit operating system. In this case, the 64-bit and SSSE3 features can be ignored, and all performance difference can be attributed to the difference in micro-architecture. On average, the 520 is faster than the 420 by 15% - 25% in integer calculations, by 7% - 15% in floating point calculations, and up to 30% in calculations utilizing MMX / SSEx instructions.