Hi
    Bought MAXIMUS VIII HERO and trying to run 6 gpus.

I started opus by adding one by one gpu 4 gpus works great,

But when I add 5th gpu it does not recognize the 5th gpu and when I exchange cables of 5th gpu to any 4th or 3rd gpu it starts to recognize the the 5th but remove the 3rd or 4th gpu means it only recognizes 4 risers not 5th.

Updated vie internet option to the current bios.

When I enable Above 4g Decoding option in bios pc hangs on startup??
 
Followed this youtube guy instructions but no effect. He is running 6 GPUs on Asus Maximus Vii so I think it will be possible on Mine Viii Hero?
https://www.youtube.com/watch?v=5f_uwC7xIno