Ati CrossfireX on Radeon HD 4870 problem

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I have two Ati Radeon HD 4870 (gigabyte GV-R487D5-1GD and gigabyte GV-R487-512H-B on a motherboard Asus P5K-E Wifi AP and the 1st card covers gigabyte GV-R487D5-1GD my PCI-e x16 slot 1 (blue) and the 2nd card covers gigabyte GV-R487-512H-B my pCI-E x16 slot 2 (black) both of them installed rigth. Problem is the CrossfireX aren't enable (problem no function), and in Ati Catalyst no display CrossfireX, information hardware 2nd display card disabled. Could you help me this problem? Thanks very much.