NETGEAR RN3138-100NES Diskless System Network Storage Port RJ-45: 4 x 10/100/1000M Port USB: 2 x USB3.0 + 1 x USB2.0 Port eSATA: 2 x eSATA HDD Interface: 4 x SATA (4 x Bay) Form Factor: 4-Bay Processor: Intel Atom C2558 Quad Core 2.4 GHz with QuickAssist Default/ Max. Memory: 4GB ECC UDIMM Dimensions: 1.70 x 19.10 x 16.00