61CHAPTER 7: SPECIFICATIONSMemoryConnectors four internally-accessible DDR3 DIMM socketsCapacities 1 GB, 2 GB, and 4 GB1333 MHz, 1600 MHz, and 1866 MHzMinimum 3 GBMaximum 16 GBMemory types 2- channel DDR3NOTE: For instructions on upgrading the memory, see “Removing and ReplacingMemory Module(s)” on page 37.Back Panel ConnectorsIEEE 1394 one 6-pin serial connectorNetwork adapter one RJ45 connectorUSB one 4-pin USB 3.0-compliant connectorsix 4-pin USB 2.0-compliant connectorseSATA one 4-pin connectorAudio 7.1 channel line output, stereo microphone, andstereo line input connectorsS/PDIF one optical and one coaxial output connectorTop Panel ConnectorsUSB one 4-pin USB 3.0-compliant connectortwo 4-pin USB 2.0-compliant connectorsAudio one stereo headphone and microphoneconnectorsCommunicationsNetwork adapter 10/100/1000 Ethernet LAN on system boardWireless (optional) WiFi/Bluetooth wireless technologyDrivesExternally accessible three 5.25-inch drive bays for a Blu-ray Disccombo, Blu-ray Disc Writer (6x), DVD+/-RW, DVDCombo, or Media Card Reader (optional)Internally accessible four 3.5-inch drive bays for SATA hard drivesNOTE: Your computer supports up to two SATA3.0 (6Gb/s) hard drives.