Opinions on this rig?

[webos]

Those cards are two slots wide, but it looks like the card slots are spaced such that you can get all three in there?

epixoip says that the one-fan cards are superior, so that's good.

If you're primarily doing GPU hashcat, you won't need a lot of CPU.  Other cracking activities do need CPU, though.

I'm not familiar with this board/CPU, but the GPUs are only going to pull 165W max each, so a 1600W power supply may be overkill.

RAM is cheap right now.  You might want to bump up the RAM to 32GB (or more) so that you can do more PRINCE if/when you want to.

Thanks for that info. I was under the impression that 970's run high 200s(watts) when under load. 

Ya I am looking for opinions on the cpu/motherboard. I got this suggestion from https://sagitta.pw/hardware/gpu-compute-nodes/inceptus/