Are you from the United States by any chance? It's just Americans for some reason often speak like there's only US on the map of the world and nothing else exists out there, so they assume a shitload of stuff about life (sometimes applicable to their country only) and push their opinions based on those assumptions. I live in the opposite part of the world, and not only electricity costs are different here, the renting situation is also very different: there are no "80s forward houses" anywhere around, 99% of people here live in apartments of high-rise buildings. Renting warehouses is a lot more complicated and expensive here than renting apartments, it's just the way that market and legal system are in my country (electricity rates are multiple times higher for warehouses, internet connections also are, there's no affordable insurance for those locations and list goes on and on).

How do you even make this shit up? I mean, how do you assume things about people you know nothing about? I've got ~ 40% AMD cards and ~ 60% nvidia at the moment, and out of AMDs ~90% are Polaris and ~10% are Fiji. Yes, Polaris cards ARE A LOT HOTTER AND LOUDER in dual mining, and I haven't even read the claymore's thread yet — I'm basing it on my own experience. I run all my RX470/480 cards at 0.9V voltage, and ~1140-1200 MHz core, they're all rock solid stable at those settings in ETH only (and most other algos like equihash etc). Reducing the voltage further for most of the cards I've got requires significant downclocking as well, so it's not worth it (maybe ok for ETH, which relies on memory more, but I also mine other algos with AMD cards sometimes, and managing different overclocks for different algos is too much hassle for too little profit). On average at this voltage each rx 480 consumes about 130W from the wall in ETH only. My target temp is 60 Celsius and most cards are either quiet (like Nitros, spinning only at ~ 1500 rpm) or moderately noisy (like Gigabyte G1 cards, XFX, Strix etc). It's all very different in dual mining: the consumption from each card goes up to ~ 170-180W, and not only they become hot and noisy (no chance to stay under 60 Celsius anymore, most cards will run their fans at 100% now), some of them aren't even stable at 0.9V in dual mining. So I either have to increase the voltage, making them consume even more than they already do, or reduce the clocks. I did spend quite some time trying to find a balance with dual mining, and it's just not there for me. Yes, I could be making an extra ~$1 from a card, but I don't want it like this, it's just too much power spent — I'm making more money from running more cards in less power hungry mining modes (like ETH only for Polaris cards). Again, I am power limited (and most miners around the world are), and within those power limits it's more profitable right now to run more cards in less demanding modes than to run less cards in dual mining.

And 480/580 vs 1070 is not even really a choice here, cause there's absolutely no AMD cards available anywhere close to me. All the European online stores that I can order from like ComputerUniverse etc are also out of stock. Sometimes 580s pop up in local stores, but usually for ~ $500-600. I'd rather buy a GTX 1080 for that price. Or even a GTX 1070, which I still find a better card than 480/580. Right now, with the current ETH prices, It's earning a bit more than single 480/580 in ETH only, and a bit less if you compare it to Polaris in dual mining. But for the past year or so, most of the time 1070 was a better earner with Zec/Lbry/Skein/etc. AMD were only really good with ETH, and who knows what's gonna happen with ETH profitability in the next months? It can easily go down to the previous levels, like it was 3 or 6 months ago, and 1070 will then again have an advantage. It is a faster card in general, no matter what you say about it — just based on its "core count | core clock | ipc" ratio. That's why it's faster in games, and faster in most mining algos that don't rely heavily on gpu memory (like ETH does). I understand how Polaris is now a little bit more profitable in dual mining, but saying "Nvidia is absolutely a terrible choice" when comparing 580 to 1070 at the current prices? Seriously? Sounds like you need a chill pill, a temporary extra $1 profit from 480/580 dual mining doesn't suddenly make 1070 a "terrible choice". Not even close, you're overreacting over such a trivial difference.