Problems with mining RIGS

I built 4 mining rigs with Gigabyte z270p d3 motherboard and couldnt found stability.

Sapphire rx 480 8gb x 5
Sandisk 120gb
Ballixtik 8gb ram ddr4
Evga 1300w
Intel Celeron 7th 1151
Windows 10 64 bit
Claymore 12.5V
AMD Catalyst 16.9.2

Always a GPU shows me less hasrate than the others and after minutes or hours they turn off

I did the BIOS update of the motherboard and I can not find a solution.

Please help me