My 2 GTX 1070 ti's are not being recognized?

[The Print Craftsman]

I have an AZROCK Tiachi X299 Motherboard.  I had a GTX 1080 ti watercooled GPU in it.  All was well.

I then acquired two GTX 1070 ti GPUs and decided to add them to my computer set up so that my nice hash mining would have more hashpower.

I added one and when I tried to add the 2nd one there was not enough room to install it.  So I fired things up with just the one extra GPU.  Nice Hash did not recognize it at first.  I re-installed the drivers off the Azrock website and then both GPUs were recognized and I began mining again earning even more per day.

So after a week of mining it occurred to me that if I moved my watercooled card to the very last slot I would have room for both of the GTX 1070 ti's.  It was the watertube elbow coming off my GTX 1080 ti that was not allowing me to seat another card close to it.  But by moving the watercooled card to the end slot the elbow sticks out over non-critical motherboard space. i.e. does not interfere with the PCI slots.

So this morning I moved the watercooled card to the end slot and mounted both GTX 1070 ti's into the other 2 slots.  Of course these cards are dual slot cards so they are mounted with empty slots between them.  No problem though.  I was able to mount each of the 3 cards into one of the longer pin PCI slots.  I supplied power to all of them and rebooted the computer.

 

It is only recognizing the GTX 1080 ti.  It doesn't see either of the GTX 1070 ti's.

 

This is very frustrating to me.  I re-installed the driver software again from the AZROCK website but it still doesn't see them.  They are firmly mounted in the slots.  They have power.  When I go and look at the devices.  I only see the GTX1080 ti displayed in the list.  I re-scan for new  hardware but nothing else shows up?

 

Does anyone have an idea how I might go about troubleshooting this?