The X58 will support any video card that has the SLI connectors to use the SLI bridge on (see pictures for connector & bridge)

Some of the cards that can be used are:

All 500 series cards

All 400 series cards

All 200 series cards

All 9 series cards

8 series cards above the 8800GS

Please note that you have to use the 180.48 or above drivers to utilize SLI on the X58 motherboard.