I have a Solution... Spilt the rigs into 8 cards... Initially I was doing 11 card rigs.... too many "problems" and to troubleshoot..... Yes it can run... but you need it to run like 20+ days without touching your rigs... I have like some rigs.. ran for 40+ days without touching it...

and above 8 cards, i find you have to use the onboard GPU with windows..  8 cards, can run with the PCIE GPU.. its mainly the Onboard GPU driver sometimes conflict with the PCIE GPU...

I am not very technical... just from experience.... 11 gpu sometimes restart for no reasons.... most likely blue screen... and if onboard GPU needed... you will need a HDMI dummy... otherwise if you set your program to auto run when windows booted.... it will run on PCIE GPU and it will stay in limbo...

I have 12 rigs... and I have limit them to 8 to save me a lot of time....

I just use those Ebay cheap 1600w PSU for the rigs to save money.... ran fine for like 10 months already lol touch wood... worse some to worse change PSU only.. A$130 each... Each rig.. has two 1600w CHEAP PSU each power only 4 cards... hence they can live long....

Some rigs have Corsair 1000W HX1000i.... but it's too expensive and will reduce my days ROI.....

Risers just use Version 006c with 4 capacitors 270uf... those with 3 capacitors and they will have smaller capacitor like 200uf type..  will give problems after 3 months of running.....  

Motherboard Asus Z270Ar or Asus Z370 A..... memory 8gb kingston 2400mhz