New Rig issue - System Crashing with 6th RX580

[kcheel]

Just put a 2nd rig together with 6 MSI Gaming RX580 cards on a H81 PRO BTC board.  Runs fine with up to 5 cards but crashes on boot up every time I plug in the 6th.  I have had Code 43 errors before, so was not going to be surprised by that but not sure what is problem here.  I have not touched any setting on the cards yet.  Using Win 10 Pro and latest AMD drivers and Claymore 9.5 miner.  Any one have any idea what the problem is?  I have rotated the 5th and 6th GPU to make sure the GPU is not bad but does it with either one as soon as the 6th is hooked up.

[kcheel]

Anyone have any suggestions?  Thanks.

[MATHReX]

BIOS Settings!!!!
-> Enable 4G Decoding and set PCIE x16 and PCIE x1 Link Speeds to GEN2. Done.