The ATI Radeon HD 4870 Graphics Upgrade Kit for Mac Pro (Early 2008 or 2009) from Apple is a graphics card for installation in the Early 2008 (Xeon 5400) or Early 2009 (Xeon 3500 and 5500) revision of the Mac Pro desktop workstation.
The card features a Mini DisplayPort and a Dual-Link DVI port for video output. The card features 512MB of GDDR5 memory and a PCI Express 2.0 interface. It is a high-performance card, ideal for use in creative, scientific, and technical applications.