Anyone have any suggestions to this problem, I am all ears.
I have one of my rigs which uses a Asus Prim z270-a when I put the 6th GPU in it will not POST to the bios screen therefore not start up.
From troubleshooting it only happens if I have 2 GPUs plugged into the X16 slots, if I only have one it works fine.
I have changed the BIOS to the recommend from the thread here for the z270-a and set it all to GEN2.
Any other suggestions?
There were 4 Gen2 settings I needed to change, did you change them all? Could be an issue running 2 on the board with 7 or more, i've only tested with 1 on the board +6 risers or all risers. Check for faulty riser cables too, that slowed up a friend of mine getting 7 going on this board.
This was my thought as well; WarwickNZ.
I'm not sure if you can use 2x GPUs direct on the mobo + 5x with risers with this mobo.
When using a GPU directly more pcie lanes / pcie bandwidth is used. This may result in insufficient bandwidth on one of the cards to enable normal operation.
While using a card directly I would change the pcie bandwidth to gen2 for all cards. Then when you get your risers, I would change it back to auto.
As WarwickNZ indicated; there are multiple pcie bandwidth related settings in the bios. There may also be an SLI setting that needs to be disabled as well.