NETGEAR ReadyNAS 3138 Diskless 1U Rackmount NAS (RN3138) 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: 1U 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