I've got gigabyte GA-890FXA-UD5 motherboard, which has 2 PCI X1 and 4 PCI X16 connectors,
I've got 2 ASUS 7970 MATRIX, 2 Sapphire R9 280X Vapor-X and 1 Powercolor 7970 V3 (together 5) GPUs.

No matter what I do, there's always 1/5 GPUs that gives code 43 error when I look in the device manager. First I thought that there was something wrong with one of the specified,
but now I see that every card works if there are 1-4 connected  and one of them doesn't if there are all connected.

Can this be resolved or do I have to buy another motherboard?

Thanks for help