IBM Intel Xeon E5-4650 2.7 GHz 1600 MHz (20 MB cache) 130W. Processor socket: Socket R (2011), Processor clock speed: 2700 MHz, Processor front side bus: 1600 MHz. Maximum RAM supported: 1500 GB, Supported memory types: DDR3-SDRAM, Supported memory clock speeds: 800, 1066, 1333, 1600 MHz. Thermal power: 130 W, VID Voltage Range: 0.6 - 1.35 V. Compatibility: IBM System x3750 M4