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.Primary InformationProcessor / Product Type : Processor Processor Type : Quad-Core Xeon Processor Clock Speed : 2.66 GHz Processor / Data Bus Speed : 1333 MHz Package Type : Intel Boxed Enhanced SpeedStep technology Demand Based Switching Intel Virtualization Technology Intel 64 Technology Intel Advanced Smart Cache ProcessorProcessor Number : X5355 Multi-Core Technology : Quad-Core Processor / Socket Type : Socket 771 Processor / Package Technology : LGA771 Processor Installed Qty : 1 CacheCache Memory Type : L2 cache Cache Memory Installed Size : 4 MB Service&SupportService & Support Type : 3 years warranty UNSPSC CodeUNSPSC Code : 43201503 Product IDUPC: 735858191395Manufacturer Part: BX80563X5355A