Z270-A can have 9 GPUs.
I have Z270 Prime P and It can have 8.
i am currently running 8GPUs on my z270-A but from what i hear, if i want a 9th card it will have to be a completely different maker for windows 10 pro to pick it up.
( EX: 8 = GTX1060s and 1 = rx580 )
can anyone confirm this?
I wouldn't say 9 Nvidia or 9 AMD cards is impossible, but it's definitely uncommon and would definitely require quite a bit of tinkering.
But yeah, currently the generally accepted limit for Windows 10 is 8 for Nvidia GPUs and 8 for AMD GPUs. There are other limitations to be aware of, however. I have yet to see someone running a stable 16 GPU rig with 8 Nvidia and 8 AMD GPUs, but 8 Nvidia and 1 AMD is definitely possible.