Use the cable you already have. 

Just be aware of the new distances numbers based on the new SMPTE formula (-40dB @ 1/2 clock)

Cable originally designed for SD

         -270 MHz (tested to 400 MHz)

         -Then HD (1.5 GHz) tested to 2.25 GHz

         -Then 3G (3 GHz) tested to 4.5 GHz

         -Are now running 12 GHz/4k