@Citronick
About the part of your farm mining Eth , do you point everything at NH for BTC ?
Or do you point a part to a pool in order to hold some ETH too ? in that case , what pool do you use nowadays ?
About 1.6GHs at Dwarfpool (keep in vault and sell just before POS) and about 3.2GHs on NH (30% vaulted & expenses and 70% convert to cash & expenses).
About 22 rigs (22x6xRX470) not online yet because I am short of server PSU -- hopefully yslyung gets his inventory soon.
To maximize profits and ROI quickly of 2nd GPU farm, ride the ETH and BTC wave.
The 1st farm is fully paid for thanks to ETH - that took nearly 1 full year of ETH mining.
Keep it realistic and practical, all of us spends a lot of money on mining equipment so you need to get them to work 24x7 asap, as stable and consistent as possible.
Moving from Windows to smOS Linux, deploying SRR and switching from ATX PSU to server PSU, were 3 major decisions that simplified mining operations -- and gained savings, less headache, more sleep.... in the long run.
Avoid the 7,8,9 card experiments (I thank my lucky stars on bailing out on Pandaminers) because every downtime is money not realized. Every disruption to hash not being submitted to stratum server, will result in inefficient speed to confirmed hash at poolside so if you have servers that are misbehaving, you need to stabilize them. OC is fun, but I learnt my lesson, undervolting is critically mandatory for mining farms.
The bigger the rigs, the bigger the PSUs, cooling issues and riser nightmares -- keep them simple like Phil's strategy.
Meanwhile, I started a mini NVIDIA farm 14 x Zotac 1070 Minis and 14 x 1080tis (GA-Auros, Zotac, Asus).
Still tweaking here and there with fullzero's NVOC Linux and soon smOS.
Its great to be mining this year and beyond -- I hope it will last loooong time!
Also appreciate all the help and guidance from many experts out there.