ATI Radeon HD 6870 runs officially at 900MHz. The GDDR5 works at 1050MHz or 4200MHz (only in quad band) and has a 256-bit memory controller. The graphics card heat sink has a dual slot cooler and supports CrossFire. The card also has two six pin power connectors.
The only card with two DVI Ports, two mini display ports, and one HDMI port. Complete specification is still unknown. The card is launching tentatively on 22nd October. The card’s retail price should be around 250$ as per the source.