Operating System :Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel® 5400 chipset Processors :Dual-core Intel® Xeon? 5200 series processors; Quad-core Intel® Xeon? 5400 series processors; Memory Support :Up to 64GB1 quad-channel 667MHz ECC and 800MHz ECC memory; Up to 16 DIMM slots; Hard Drive :SATA 3.0Gb/s 7200 RPM 16MB up to 1.0TB; SATA 3.0Gb/s 10K RPM 16MB up to 160GB; SAS 15K RPM up to 300GB Removable Media :CD-RW/DVD Combo, DVD-ROM, DVD+/-RW, Blu-ray, USB Floppy Drive, USB media card reader Expansion Bays :Four internal 3.5? hard disk drive bays; Three external 5.25? optical bays; One external 3.5? flex bay Expansion Slots :One PCI-e x8 slot wired as x4; Two PCI-e x16 Gen 2 slots; Three PCI-X 64bit/100MHz slots, One PCI 32bit slot; Graphics :Support for 2 PCI Express x16 Gen 2 graphics cards up to 225 watts Audio :Integrated High Definition Audio Communications :Integrated Broadcom? 5754 Gigabit Ethernet controller I/O Ports :Front: Two USB 2.0, Mic/Headphone; Rear: Five USB 2.0, Two PS2, Two Serial, Audio I/O Input Devices :Dell Enhanced QuietKey USB; Enhanced Multimedia USB; Smart Card keyboard USB Dell USB two-button mouse and Dell USB optical two-button scroll mouse Power :980 watt 80%+ Efficiency Power Factor Correcting (PFC) power supply Dimensions :(WxHxD) 8.5? x 22.26? x 22.3?, 21.59cm x 56.54cm x 56.6cm Weight :N/A

Operating System : Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q170 Chipset Processors : Intel Pentium and Intel Core™ i3, Intel Core i5, and Intel Core i7 6th Gen Memory Support : Four (4) DIMM slots , Up to 64 GB DDR4 2133 UDIMM Hard Drive : SATA 6.0Gb/s, 2.5"/ 3.5" wide, 5400 / 7200 rpm, Solid State Hybrid Drive (SSHD), Solid State Drive (SSD), M2 Removable Media : Optional 9-in-1 media reader, DVD-ROM SATA or Multi DVD-RW Expansion Bays : External: One (1) 9.5mm high, Internal: One (1) 3.5-inch, One (1) 2.5-inch Expansion Slots : One (1) PCI-e (LP) 3.0 x16, One (1) PCI-e (LP) 3.0 x1, One (1) PCI-e (LP) 3.0 x4 Graphics : Intel HD Graphics 510/530 Audio : High Definition (HD) Audio, Realtek ALC662 Communications : Gigabit ethernet, Intel Ethernet Connection I219-LM I/O Ports : Front: Two (2) USB 3.0, Audio I/O Rear: Six (6) USB 3.0, Audio I/O, Serial, VGA, Two (2) DP Input Devices : Preferred Pro USB Keyboard (USB connector), Lenovo logo Enhanced Optical USB Mouse, black, Lenovo logo Power : 210 watts, autosensing, 85% PSU Dimensions : 338mm X 357mm X 88mm Weight : 12.3 lb (5.6 kg)

Operating System : Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q270 Chipset Processors : Intel Pentium and Intel Core i3, Intel Core i5, and Intel Core i7 6th & 7th Gen Memory Support : UDIMM, DDR4-2400, 4 x 288-pin DIMM sockets Hard Drive : SATA 6.0Gb/s, 2.5"/ 3.5" wide, 5400 / 7200 rpm, Solid State Hybrid Drive (SSHD), Solid State Drive (SSD), M2 Removable Media : Optional 9-in-1 media reader, Sim DVD Burner Expansion Bays : Bay 1 Slim external optical drive bay, Bay 2 3.5", internal bay for HDD/SSD, Bay 3 2.5", optional internal bay for HDD/SSD Expansion Slots : One (1) PCI-e (LP) 3.0 x16, One (1) PCI-e (LP) 3.0 x1, One (1) PCI-e (LP) 3.0 x16 (x4 signal) Graphics : Up to Integrated Intel HD Graphics Audio : High Definition (HD) Audio, Realtek ALC662 Communications : Gigabit ethernet connection I/O Ports : Front: Four (4) USB 3.0, Audio I/O Rear: Four (4) USB 3.0, Audio I/O, Serial, VGA, Two (2) DP, LAN, Two (2) PS2 Power : 180W, autosensing, 85% PSU Dimensions : 290.5 mm x 92.5 mm x 343.5 mm Weight : 5.4kg

Operating System :Windows 7 Home & Pro. MAR, Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset :Intel® 5520 Processors :Four-Core and Six-Core Intel Xeon Processor 5600 Series Memory Support :12 DIMM Slots for DDR3 ECC, 3-channel 800/1066/1333 MHz DDR3, Up to 192GB Hard Drive :250GB to 3TB SATA 3.0-Gb/s, 300GB to 600GB SAS, 128GB to 300GB SSD Drives Removable Media :16X DVD-ROM SATA Drive, 16X DVD+/-RW SuperMulti SATA Drive, Blu-ray Writer Expansion Bays :External: Three (3) 5.25-inch, Internal: Four (4) 3.5-inch Expansion Slots :2 PCIe x16 Gen2 Slots, 2 PCIe x8 Gen2, 1 PCIe x4 Gen2, 1 PCIe x4 Gen1, 1 PCI Slot Graphics :N/A Audio :High Definition integrated audio with internal speaker Communications :Dual integrated Broadcom 5764 Gigabit LAN I/O Ports :Front: Three (3) USB 2.0, Headphone/Mic, Rear: Six (6) USB 2.0, 2 PS2, 1 Serial, Audio I/O Power :Choice of 850W, 85% or 1110W, 89% Power Supplies Dimensions :44.4 x 20.3 x 52.5 cm; 17.5 x 8.0 x 20.7 inches Weight :21 kg (46 lb)