Miner only with 6 GPUs - 2.2GB per month, 8 GPUs 2.7GB per month.

This thread if for EWBF miner not PSU discussion, but answering some replies about PSU.

No, it is NOT dependant of manufacturer of PSU if you can attach 4 GPUs to it or not.

It is dependant only on two things - firstly - does your PSU can produce required wattage for your system? As rule of thumb good way to look at it is that system itself will draw around 100w so rest is left solely for your GPUs, so you looking around 650W for GPUs. For 4 cards that's 162.5W per card. You could easy run slightly under-clocked GTX 1080 with that or GTX 1070 with maximum possible OC. So in your case you could even go with smaller PSU, but most PSU bellow 750 don't have more then 4 PCI-E power cables and that's your second limitations - number of cables.

Im running 8 GTX 1070 with 1000w PSU with ease and stable.

Number of GPUs you can get out of motherboard is easily found by looking at 3 slots. PCI-E 16x, PCI - E 1x and M.2.

You add all those together and that gives you total number of GPUs you can attach and get working with that motherboard. There are some limitations for OS without modifying it ( Windows no more then 8 GPUs ).

As example, two best selling motherboards from amazon.com

ASUS PRIME Z270-A - 3x PCI-E 16x, 4x PCI-E 1x and 1x M.2 thus allowing you easily build 8 GPU or less GPU rig with it.

ASUS ROG Maximus IX Hero - 3x PCI-E 16x, 3x PCI-E 1x and 2x M.2 thus same as PRIME Z270-A total of 8 or less GPUs.

So basically, get cheapest motherboard that have sum of those 3 slots to number of GPUs you want to attach.

Just keep in mind that you will have to change some BIOS setting to make this work. One reason specialised motherboards like Biostar TB250 or Asrock BTC+ are easier - BIOS already pre-set to see all possible GPUs you attach.

What does manufacturer of PSU have to do with it? Nothing.

Just reduce amount of OC you have as when dual mining you are maxing out your GPU and it gives errors that crashed miner and system. Run all cards stock and slowly increase OC until you notice any crash/instability. Then go back a step and leave it there.

No, it is not being inflated. It keeps correcting itself, like we saw downfall couple of days ago. BTC price is growing do to simple supply/demand. BTC supply is diminishing and there will be limited supply of BTC and that cant be changed. Demand for BTC grows as more and more people start to use it as currency, good example is when Japan adopted it officially and BTC price skyrocketed ( massive increase in demand, no increase in supply ).

Good analogy is oil, when we considered that there is limited supply of it, oil price kept rising, as soon as we found more oil and new ways to get it from places we couldn't before, price fell. But in case of BTC there wont be found new way to supply it. It is truly limited to 21mil.

It already is. Check trade volumes, most of altcoin is traded to btc. Check prices - btc falls and altcoins falls straight after.

No, you are wrong. People entering market is directly proportional the price. If you would overlap difficulty increase chart and price increase chart you would see that difficulty increases more rapidly AFTER price have gone up, therefore, people enter more, when price has goes up, people leave after price has gone down.

So you can not make assumption that price will go down or stay the same and new people will join at same rate. If price stays the same, gradient how fast people join mining will reduce with time as it will get less profitable and will saturate at point where most people will consider it not profitable.

But from looks of it, alt coin mining is satellite of bitcoin mining - you mine altcoins to change to btc, so price of altcoins are tied to btc.

Yes, your logic is off. Two weeks ago ETH didn't cost 230 but 90 so you lost 30% of eth, but price of it increased 250%.

Reason that you cant?

Yes you can, in fact, you can do 6 cards as well, but there is not enough cables for most of 750w psu to do that.

I think 1070 are the best as you get best sol/w ration, I am currently sitting stable ( uptime for 2 of my 6gpu rigs 5 weeks atm) at 3.7 ratio (420 sols per 113-115w).

When you look at this from money point of view and cost savings, then only cost saving you get by using 1080ti is fact that you use less systems components. For example, 2 1080ti rigs would be around same as 3 1070 rigs so you require 1 less mobo, cpu, ram, ssd and psu.

But psu is tricky because 1080ti would require much psu with much higher wattage and to get double wattage psu you have to pay 3x the price there for it offsets gains from saving on 1 less mobo, cpu, ram and ssd. As example for gold rated EVGA PSU - 750w psu gets you 7.5w per euro, 1000w psu gets you 5.2w per euro and 1600w psu gets you 4.1w per euro (prices off evga eu web site).

As well, you have to take into consideration your electricity cost. If its anything like in EU, around 0.15 euro cents per kwh, then electricity savings should be priority and you should always go for gold rated psu. I had done calculations to see how much you save going from bronze to gold or bronze to platinum and gold is most efficient choice.

Same goes for dual mining. It requires a lot of power. A lot of power significantly increases cost of you whole system + risk of component failure ( high heat ) + cost of cooling the room.

What I have found is that most efficient is to have 8x gtx 1070 rigs with 2x 750w gold psu runing ZCash only. Gives you best sol/w ration and fastest ROI time due to saving on system cost compared to 6x gtx 1070 rig.