HP ProDesk 405 Windows 7 Professional Business Micro Tower Desktop (AMD A8-6410 2GHz, 2.4Ghz Turbo, 8GB DDR3 Memory, 1TB Hard Drive, CD/DVD) AMD Quad-Core A8-6410 Accelerated Processor with AMD Radeon R5 Discrete-Class Graphics (2.0GHz base 2.4GHz turbo, 2MB L2 cache, 25W) 1TB SATA 7200RPM Hard Drive: Dont settle for the 5400RPM on many competing models  8 GB RAM for multitasking performance (PC3-12800 1 x 8GB upgradable to 16GB) DVDRW Optical Drive: Reads and Creates DVDs and CDs  Wireless LAN 802.11 a/b/g/n  10/100/1000Mbps  USB Mouse  USB Keyboard DTS Sound+ audio management software  Windows 7 Professional 64-Bit comes installed and a Windows 8.1 Professional license is included Multi-independent monitor support via VGA and DisplayPort 1.2 video interfaces  Redesigned expandable, upgradable Microtower chassis