Nvidia sli fail ?

I got a gtx 580 on my pci-e slot 2, then i bought a new gtx 580. i swapped my old card to slot 1 and new card to slot 3 but my pc could not find any of the graphic cards so i had to change it back to one gtx 580 in slot 2 then all was normal. Anyone know how t ofix it ?

my pc
Rampage IV formula
3930k prossesor
1 geforce gainward gtx 580
1 gigabyte geforce gtx 580
Haf X big tower
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  1. Did you try reading your motherboard manual?
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