Interestingly, the two cards both feature black PCB board, not 100% taking ATI reference design. XFX designed the cooler for Radeon HD4850 512MB (Model: XFX HD485X-YDFC) on its own, and Radeon HD4870 features 1GB memory. They have adopted AMD reference clock speeds.

http://en.expreview.com/2009/01/04/x...-pictured.html