HEWLETT PACKARD Intel Xeon 5130 2.00 4MB/1333 DC,2ND Cpu Dual Core. 4MB Cache Per Core, 1333FSB 2nd Dual-Core Intel Xeon processor 5100 Series with Intel 64 Architecture, and 4 MB of Shared L2 cache Dual-Core Intel Xeon Processor 5130/ 2.00 GHz,1333 MHz FSB EY014AA HP Brand 2nd CPU for using with HP Workstation XW6400 and XW8400 with HP Heatsink