 Radeon HD 2900 and HD 3000 series cards use the same ribbon connectors, but the HD 3800 series of cards only require one ribbon connector, to facilitate CrossFireX.Unlike older series of Radeon cards, different HD 3800 series cards can be combined in CrossFireX, each with separate clock control.Since the release of the codenamed "Spider" desktop platform from AMD on November 19, 2007, the CrossFire setup has been updated with support for a maximum of four video cards with the 790FX chipset; the CrossFire branding was then changed to "ATI CrossFireX".