The Xeon E5420 2.5 GHz Quad Core second processor from Dell is designed for multi-processor server platforms. The quad-core processor architecture places four execution cores, or computational engines, within a single processor. This processor, with 1333 MHz bus speed, offers excellent performance and headroom for peak Internet server loads, resulting in faster response times, support for more users and improved scalability. The processor features demand based switching and execute diable bit for enhanced security. Additionally, the Intel EM64T offers support for both 32-bit and 64-bit applications and operating systems.