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Srory ,  i am bad , i remember not that the problem is with the  HD4850X2 2GO - dual GPU and only single PCI-e slot connector  !
I use at this time 2 * HD5770 single slot but the  2 * cards use 2 * PCI-e slots ..
Pierre
* I reinstall my old HD4850X2 card i i look with F7E BIOS ...