Processor - 1 x Intel Xeon X5355 / 2.66 GHz ( 1333 MHz ) - LGA771 Socket for $549.95

This industry's first quad-core processor for mainstream servers provides breakthrough performance and capabilities for the ultimate in powerful, dense and energy efficient servers. With the Quad-Core Intel Xeon processor you get breakthrough performance - up to 50% greater than the industry-leading Dual-Core Intel Xeon processor in the same power envelope. : Intel Quad-Core Xeon X5355 / 2.66 GHz processorProduct Type: ProcessorProcessor Type: Intel Quad-Core Xeon X5355Multi-Core