Tower

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 H61 Express
Processors : Intel 2nd Generation Core i3, Intel Pentium, Intel Celeron
Memory Support : Up to 8 GB DDR3 1600 MHz SDRAM, 2 DIMM Slots
Hard Drive : HDD
Removable Media : N/A
Expansion Bays : External: One (1) 5.25-inch, Internal: One (1) 3.5-inch
Expansion Slots : One (1) PCI Express x16, Three (3) PCI Express x1, One (1) Mini PCI
Graphics : Integrated graphics (Intel HD, Intel HD 2000, Intel HD 3000, Intel HD 4000) based on processor
Audio : Realtek ALC656
Communications : Integrated Realtek RTL8171E Gigabit Ethernet Controller
I/O Ports : Front: (2) USB 2.0 ports, dedicated headphone port, microphone jack, Rear: Four (4) USB 2.0 ports, RJ-45 Ethernet Port, DVI-D and VGA video ports, audio in/out jacks (5.1 channel audio out)
Power : 300 W
Dimensions : 16.5 x 38.9 x 36.8 cm
Weight : 6.932 kg to 7.18 kg (approximate)

Operating System : Windows 10 Home & Pro MAR, Ubuntu Linux, Free DOS
Chipset : Intel H81
Processors : Intel Core i3, i5, i7 4th Gen
Memory Support : Two (2) DIMM slots , Up to 16 GB DDR3
Hard Drive : Sata 6Gb/s 7.200 rpm up to 1TB
Removable Media : DVD-ROM/ DVD-ReWritable
Expansion Bays : External: One (1) 5.25-inch, One (1) 1.5-inch , Internal: Two (2) 3.5-inch
Expansion Slots : One (1) PCIe x 16, Two (2) PCIe x 1
Graphics : Intel HD Graphics
Audio : HD Audio, Realtek ALC662 codec
Communications : Gigabit ethernet, Realtek RTL8111GN
I/O Ports : Front: Two (2) USB 2.0, Audio I/O  Rear: Two (2) USB 3.0, Two (2) USB 2.0, VGA, DP, RJ-45, Audio I/O
Input Devices : Standard Keyboard, Mouse (USB)
Power : Based on configuration
Dimensions : 40 x 39.7 x 16 cm
Weight : 7.5 kg