Operating System : Windows 10 Home & Pro MAR Chipset : Intel Q965 (ICH8) Express Chipset Processors : Intel Core 2 Duo, Intel Pentium D, Intel Pentium 4 Memory Support : Four (4) DIMM slots , Up to 8 GB DDR2 800 MHz SDRAM  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 : Two (2) 5.25-inch, One (1) 3.5-inch Expansion Slots : One (1) PCIe x16, One (1) PCIe x1, Two (2) PCI Graphics : Intel® Graphics Media Accelerator 3000 Audio : ADI 1983 High Definition Audio Communications : Broadcom 5754 Gigabit Ethernet LAN solution 10/100/1000 I/O Ports : Front: Two (2) USB, microphone, headphone, Rear: Six (6) USB, Stereo line in, Speakers line out Input Devices : Dell USB Entry Keyboard, Dell USB Multimedia Pro Keyboard, Dell USB Entry Optical Mouse, Dell Laser Mouse Power : 305W 76% efficient active PFC Dimensions : 43.8 x 41.4 x 18.5 cm Weight : 12.34 kg