I have this board and was running 6 gtx1070's with claymore.  Decided to add more GPU's.  I am running Win10.  I was told I could only run 8 invidia & 8 AMD.  So I purchased 3 RX580's.  Now the Bios sees all the GPU's but Windows only recognizes 5 of the 1070's.  Any help would be appreciated.