Today, I finally ordered 6 x AMD Radeon VII, I've been planning for quite some time now. Fingers crossed it should be delivered tomorrow or Saturday, also ordered 2 x Asus GTX 1070 OC 8GB.
So now my small rig contains:
6 x Asus GTX 1070 0C 8GB
6 X MSI AMD Radeon VII 16GB
I think having all 6 Radeon VII in 1 rig will be a pain, plus alot of undervolt would be required. I will install 4 GPUs first, check the performance and add 1 GPU at a time if possible.
Yeah, I heard about the Nicehash hack. I was affected not much but still, now their making good progress reimbursed more than 50% already. They're also working on Nicehash v3, I think.
My current rig has 5 x 120mm fans already installed which is running 4 x Asus GTX 1070 0C 8GB. It keeps the rig very cool and working great.
After installing the 2nd rig, if more fans are required I could always purchase :
https://www.amazon.co.uk/Oypla-Electrical-Chrome-Standing-Hydroponic/dp/B0182K76UQ/ref=sr_1_4?keywords=gym+fan&qid=1558040716&s=gateway&sr=8-4 , now these suckers are powerful!
Remember to consider your fans power draw when calculating headroom on the PSU. I think 120mm fans run around .33a on avg - so maybe about 4w each? If youre really pushing the limits of the PSU, your best bet is probably an open air rig w/ good spacing, and an external cooling solution if possible. Heres my setup for example - the 8x64 rig is on the left. The spacing alone is generally enough to keep these reasonably cool (40-45c) even at 70-80f/21-27c ambient. The cabinet is more for noise suppression and dust control (this is my garage/workshop too!) but the airflow helps on those summer days when temps get up significantly higher. Many people just point a box fan at their rigs. (btw, the fans on the one rig arent necessary, but I didnt bother removing them as I had the power headroom):