HP's most stable and secure business PCs with professional innovations such as energy efficient technologies, leading remote manageability solutions, and three flexible form factors designed to fit your specific business needs. Form Factor: Ultra Slim Desktop (USDT) Processor: Intel Core 2 Duo E8400 3.00GHz, 1333MHz FSB, 6MB L2 cache Memory : 2GB (2x 1GB) PC2-6400 DDR2 800 SDRAM, 2 SODIMM slots HDD: 160GB 7,200 rpm 3.0 Gb/s SATA hard drive Optical Drive : Slim 8X SuperMulti LightScribe Drive Graphics : Intel Graphics Media Accelerator 4500 graphics Audio : HD audio with ADI1884A codec, Internal PC speaker Network : Intel 82567LM Gigabit Network Connection Ports : 8 USB 2.0 (2 Front, 6 Rear), 2 PS/2, 1 RJ-45, 1 VGA, Audio in/out, Headphone & Mic Expansion Slots : 1 Mini PCIe Expansion Bays : Internal: 1x 2.5" , External: 1 Slimline Drive Bay Operating System : Windows Vista Business with downgrade option to Windows XP Pro