Apple - Mac Pro Desktop (Early 2008) - Intel Xeon E5462 Quad-Core 2.8GHz - 2GB RAM - 320GB HDD - DVDRW - ATI Radeon HD 2600 XT - Mac OS X 10.5.1 Apple - Mac Pro 3,1 Desktop (Early 2008) - Intel Xeon E5462 Quad-Core 2.8GHz - Mac OS X 10.6.3 Mac Pro "Quad Core" 2.8 - 2GB RAM - 320GB (7200RPM) DVDRW - ATI Radeon HD 2600 XT 256MB GDDR3 dedicated video memory Airport Extreme (802.11g/n) - Bluetooth - Dual Gigabit Ethernet - with Keyboard and Mouse (5)USB 2.0 - (2) Firewire 400 ports - (2) Firewire 800 ports - Optical digital audio in/out - (2) PCIe x4 slots, (2) PCIe x16 slots (one free)