How many is too many? I like them because they are cheap, low noise, and little electricity. I will have 12 of them when my next order comes. Is this ok?
Same boat here. Im thinking ’ should I keep getting more minidoges? or just save for a bigger thing , at the same time is hard to compete with mini’s noise lv
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Buy what you like and what works for you. Generally, what is your goal with mining?
That said, at some point, you may want to calculate your money invested per mining HashRate. It might be better (cost wise) to save for a better miner which could provide a better rate. Choice is really up to you and your goals.
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I think it depends what you are looking for you can buy 100 of these if you like but what I like to do is to compare W / Hash to consider efficiency + see how much I pay for MH vs device price.
I have below table to judge efficiency , I do not have prices there so you will not see cost of USD / MH related to device price.
Data might not be 100% correct since it is a while I created it.
For example if you buy Goldshell X5 and yiou run it on low power you will get around 600 MH with around 660 W consumption so 1.1W / MH for price of 1615 USD If you compare it with mini doge with 3 Mini doge you will get 555 MH @ 705 W so 1.27 W / MH. and price of 2400 USD
Please note I took price reference from Products – DxPool Shop and price for Mini Doge is for New and price for X5 is refurbished, just to give an example…
Bigger device is usually more noisy but can be more efficient.
So efficiency is better on X5 then on mini doge with cheaper price of device. if you look on L7 it is miles away in efficiency from mini doge. So you do what you prefer to do 
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Not sure of my goal. I started out building a 6 GPU systems with HiveOS and then bought one mini doge… then more… then more…