HP Pavilion Desktop 550-126 i5-6400 2.7GHz 12GB 1TB DVDRW W10 64-Bit, Silver, Large 6th generation Intel Core i5-6400 processor, up to 3.9GHz 12GB PC3-12800 DDR3L-1600 SDRAM memory 1x8GB and 1x4GB, 1TB 7200RPM Serial ATA hard drive Windows 10 Home Operating System, Ultra slim SuperMulti DVD Burner Integrated Bluetooth 4.0 and Wireless LAN 802.11b/g/n featuring 2.4GHz 1x1 technology Intel HD Graphics 530, 6 (2 x 2.0 , 4 x 3.0) USB Ports