HP DC7800 Desktop PC. Get your business the HP DC7800 Desktop PC. This PC has a 2.66GHz Core 2 Duo processor with 4GB of DDR2 RAM to give you sufficient speed and memory to perform all your business related tasks. You can expand the RAM up to 16GB. It also has a 160GB HDD to store all your valuable data. It comes with Windows 7 Professional 64-bit pre-installed that runs all the popular business applications. 8 USB ports (2 Front and 6 Rear), Integrated Audio. Buy the HP DC7800 Desktop PC today!