You are guys lucky that you are living in the place with low electricity rate. Here in the Philippines, the rate is almost 0.27 cents. If we are mining with AMD cards almost 50% electricity bill, unlike Nvidia card that you can lower the watts while the hashrate is higher.
AMD cards even if it's undervolted it can only reduce a small power consumption.
Do you think guys it's still profitable to mine ethereum with AMD cards? I use some calculator, but it takes years before that I can break even and get the return amount of my investment.
It all depends if AMD decides to release mining specific cards. I have a few of the Sapphire 480's meant just for mining and they are less than impressive. Nvidia cards seem to be where it is at!
Never tested yet mining cards specific like p104-100 or p106-100 There are many sellers here in my country about that card the hashrate is high and the price is fair, but it would be hard to resale these cards because it's not a gaming card. They are made only for mining purposes and miners prefer gaming graphics card because the price of cards also increasing due to low supply and higher demand.
So for me, I just choose if what is the best to choose, and I can resale them with the higher price.