Answers are below:

drivers version ?

Release Date   Type                   Version           Part Number                  OS                
11-30-2017   Driver           388.43           GeForce 10 Series Family   Windows 10 64bit

windows version (pro, enterprise, etc...) and patch level (anniversary ? creator update ?) ?
Windows 10 Pro

overclock and power levels ?
No overclocking at all - all defaults

miner logs of the crash ?
I set the flag to capture log files but the miner is not creating them...


did you tried swapping out the risers to see if you don't have a bad one ?
I will do that next - I am now troubleshooting with the known good card and it still crashes

how do you power the gpu ? (how many cables, do you use Y cables)
I have (1) 8Pin power cable and (1) 6 Pin power cable in each 1080ti

did you power the risers properly ?
can you please elaborate on this one?
I have the card plugged in to the rise then the 4 pin molex cable is connecting to the rise - the other end of the molex 4 pin is the SATA connector which is plugged in to my PSU thent he USB cable is cabled between the PCI-E slot and the riser. Did I miss anything?

did you power the motherboard properly with the added molex connectors ?
Everything with the computer works great until I start mining.

does one GPU work (one or the other) ? when you put back only one ?
I am now testing with 1 GPU and is still does crash. I also received an

Prob a bad idea to mix up AMD & NVIDIA on the same rig, but i don't think that's your problem anyway.
This is why a rebuilt entirely and now only want to focus on the 1080tis

On a side note, that's way too much SSD & memory, 8GB memory and 128GB SSD would be enough, cpu too powerful too. But that's another matter.
ok


You may also want to increase the virtual memory, make it 16GB start, and 64GB top, it will allow you to run all known algos. (16/32 would do fine too except for a very few niche one like SiB)
I increased the paging file to 32GB