No, Xfire is capable on an x4 PCIe lane, whereas SLI is only capable on x8 PCIe and above. If a board supports SLI it supports both, if it only support Xfire, it only supports Xfire.
No, Xfire is capable on an x4 PCIe lane, whereas SLI is only capable on x8 PCIe and above. If a board supports SLI it supports both, if it only support Xfire, it only supports Xfire.