Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel G41 Processors : Intel Core 2 Duo, Core 2 Quad, Pentium & Celeron Memory Support : Two (2) DIMM slots , Up to 4 GB DDR3 SDRAM PC3-10600 (1066/1333 MHz)  Hard Drive : 160MB to 1 TB , 64GB to 1TB Solid State Drive (optional) Removable Media : SATA DVD-ROM drive, SATA DVD Writer Drive, SATA Blu-ray Writer Drive Expansion Bays : External: One (1) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots : One (1) PCI 2.3, One (1) PCI Express x16, Two (2) PCI Express x1 Graphics : Integrated Intel Graphics Media Accelerator 4500 Audio : Realtek ALC662 High Definition audio codec Communications : Realtek RTL8103EL 10/100 Fast Ethernet controller I/O Ports : Front: 2 USB, audio ports, Rear: 4 USB, VGA, RJ-45, audio in/out Input Devices : Compaq USB Standard Keyboard, Compaq USB Optical Scroll Mouse Power : 300-W Dimensions : 42.8 x 38.4 x 16.6 cm Weight : 10.2 kg

Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q85 Express Processors : Intel 4th Gen Core i5 Memory Support : Four (4) DIMM slots , Up to 32 GB DDR3 SDRAM , 1600MHz Hard Drive : Up to 1TB 7200rpm Removable Media : DVD-ROM/ DVD-ReWritable (slim) Expansion Bays : External: One (1) 5.25-inch, One (1) 3.5-inch, Internal: Two (2) 3.5-inch, One (1) 2.5-inch Expansion Slots : One (1) PCI Express x16, Three (3) PCI Express x1 Graphics : Intel HD Graphics Audio : Realtek ALC221 codec Communications : Intel I217LM GbE Network Connection I/O Ports : Front: 2 USB 3.0, 2 USB 2.0, Audio I/O, Rear: 2 USB 3.0, 4 USB 2.0, VGA, DP, RJ-45, Audio I/O,PS/2 Input Devices : Standard Keyboard (USB or PS/2) Power : 320 W Dimensions : 44.2 cm x 39.9 cm x 17 cm Weight : 9.3 kg

Operating System: Windows 10 Home & Pro MAR, Windows 11 Home & Pro, Ubuntu Linux, Free DOS Chipset : Intel H110 Processors : 7th Generation Intel Core i3, i5, i7, Intel Pentium, Intel Celeron Memory Support : Up to 16 GB DDR4-2400 SDRAM Hard Drive : SATA HDD or SSD Removable Media : N/A Expansion Bays : One 3.5" HDD Expansion Slots : 1 PCIe (x1), 1 PCIe (x16), 1 M.2, 1 PCI 2.1 Graphics : Integrated: Intel HD Graphics Audio : Conexant CX20632 codec Communications : Integrated 10/100/1000M gigabit Ethernet controller, Realtek RTL8111HSH-CG GbE Ethernet Controller I/O Ports : Front: 2 x USB 3.0, 1 microphone/headphone jack, Back: 2 x USB 3.0, 4 x USB 2.0, HDMI, power connector, RJ-45, VGA, security lock slot, audio in connector, audio out connector, padlock slot, serial, PS/2 Power : 180 W Dimensions : 17 x 27.4 x 33.8 cm Weight : 5.45 kg

Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q270 Processors : Intel Celeron, Intel Pentium, Intel Core i3, i5, i7 6th & 7th Gen Memory Support : Four (4) DIMM slots , Up to 64 GB DDR4 Hard Drive : Sata or SSD Removable Media : Optional External Bays : One 5.25", One slim ODD, 1 SD 4 card reader Expansion Slots : 1 M.2 2230 for optional wireless NIC, 1 M.2 2280 for storage drives, 1 PCIe 3.0 x16, 2 PCIe 3.0 x1, 1 PCIe 3.0 x4 slot using x16 connector for Optane support 2 Graphics : Intel HD Graphics 530 Audio : Conexant CX20632 codec with universal audio jack and 2W internal speaker, headset and headphone front ports (3.5 mm), multi-streaming capable Communications : Intel  I219LM Gigabit Ethernet Port I/O Ports : Front: 1 headset connector, 1 USB 2.0 (fast charging), 1 USB 2.0, 2 USB 3.1 Gen 1, 1 USB Type-C? (charging), 1 SD 4 card reader (optional), Back: 1 RJ-45, 2 USB 2.0, 1 power connector, 4 USB 3.1 Gen 1, 1 audio-in; 1 audio-out, 1 DisplayPort? 1.2 Power : 180 W or 250 W Dimensions : 17 x 27.4 x 33.8 cm Weight : 7.14 kg

Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset : Intel Q270 Processors : Intel Celeron, Intel Pentium, Intel Core i3, i5, i7 6th & 7th Gen Memory Support : Four (4) DIMM slots , Up to 64 GB DDR4 - 2400 Hard Drive : M.2, Sata III or SSD Removable Media : Optional Expansion Bays : One (1) slim ODD, One (1) 2.5" HDD, Two (2) 3.5" HDD, One (1) 5.25" Expansion Slots : Two (2) FH PCIe x1, Two (2) FH PCIe x16, one wired as x4, One (1) M.2 2230 for optional wireless NIC, One (1) M.2 2280 for storage drives Graphics : Intel HD Graphics Audio : Conexant CX20632 Audio Codec Communications : Intel  I219LM Gigabit Ethernet Port I/O Ports : Front: One (1) audio out, Two (2) USB 2.0, One (1) USB Type-C, Two (2) USB 3.1 Rear: : One (1) RJ-45, Two (2) USB 2.0, Four (4) USB 3.1, One (1) choice of DisplayPort, HDMI, VGA or USB Type-C Power : 250 W standard efficiency; 500 W standard efficiency Dimensions : 15.4 x 36.9 x 36.5 cm Weight : 9.86 kg

Operating System: Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS Chipset: Intel Q170 Processors: Intel 6th generation Core i5-i7 Quad Core, Core i3 Dual Core Memory Support: Four (4) DIMM slots , Up to 32 GB DDR4 Hard Drive : Up to 2 TB SATA, 7200rpm or SSD (optional) Removable Media : DVD-ROM/ DVD-ReWritable Expansion Bays : External: Two (2) 5.25-inch, Internal: One (1) 3.5-inch Expansion Slots : One (1) PCIe x 4, One (1) PCIe x 16, One (1) PCI Graphics : Integrated Intel HD Graphics 530 Audio : Integrated Audio Communications : Integrated Intel i219-LM GbE Network Connection I/O Ports : Front: Two (2) USB 2.0, Two (2) USB 3.0, Cardreader (optional), Audio I/O Rear: Four(4) USB 3.0, Two (2) USB 2.0,Two (2) DP, HDMI, VGA, Serial, RJ-45, Audio I/O, PS/2 Input Devices : Standard Keyboard, Mouse (USB or PS/2) Power : 240 W Dimensions : 35 x 15.4 x 9.27.4 cm Weight : 8 kg