HP Compaq dx7500 Microtower PC. Processor clock speed: 3000 MHz, Processor model: E8400, Processor family: Intel Core 2 Duo. Maximum internal memory: 16 GB. Operating system installed: Windows Vista Business, Bundled software: 2007 Microsoft Office Ready (60 days); McAfee Total Protection-Small Business (60 days). Weight: 10.2 kg. Dimensions (WxDxH): 185 x 257 x 385 mm, Modem type: LSI PCIe x1 56K PCI SoftModem (Optional), Power supply type: 300W ATX power supply - PFC/non-PFC