HP 280 G1 P0C88UT#ABA Desktop (Black) 3 GHz Intel Core i5-4590S (up to 3.7 GHz, 6 MB cache, 4 cores) - Intel HD Graphics 4600 4 GB DDR3-1600 SDRAM (1 x 4 GB) - 500 GB 7200 rpm SATA Hard Drive - SuperMulti DVD-Writer Gigabit Ethernet - VGA - DVI-D - 6 x USB 2.0 - 2 x USB 3.0 - Trusted Platform Module (TPM) 1.2 USB Optical Mouse and Keyboard Microsoft Windows 7 Professional 64-bit (Windows 10 Pro downgrade) - pre-installed: Windows 7