I have built a new workstation and just for fun tried to get some money back by mining.
There is many lovely "crypto profit calculators" with big earnings BUT there is lots of stuff missing.
It makes me wonder why people still GPU mine.
My PC is not mining rig so there is too much power loss...after some pimping around, I have pushed my MSI RX 5700 XT to stable 57Mh/s on ETH with questionable 110W (SW GPU readings) and to compensate for that hungry baby AMD Ryzen 9 3900X, I make it busy with XMR mining. The whole system after various optimisations draws 360W...well that is what APC UPS claims so I guess that is real value drawn from power grid.
I have noticed various GPU mining rigs miners that they love to talk about "real" power draw of GPU with some mentioning real power draw from grid. Just little technical background tells me that GPU that draws 100W (GPU sensor reading) has got 110W power draw on MoBo due current/volatge regulators on MoBo and then once again power losses in PSU, which is in my case less than 10%. End result of GPU power draw is 132W ((100*1.1)*1.1) for simplicity sake...it may be less, it is just an estimate.
My PC idles at about 90W with LCD off. Just running this mining operation draws 220W (confirmed by UPS reading) for 57Mh/s on ETH. Of course my file server with 5 x 3TB disks idles around 40W so it is without doubt possible to build a more efficient mining PC with theoretical 170W for 57Mh/s or even less with some losses in hashrate in sake of efficiency per Watt.
What is interesting that most crypto profit calculators do not take into account fees...BetterHash promises you riches beyond wildest dreams ROFL.
So I did some "real" calculation and I wonder if someone can confirm my theory because I have just about a week of real data from ethermine.org statistic.I am using Win 10 right now with fastest ETH miner in business the PhoenixMiner. Devfee is 0.65%, ethminer pool has got 1% fee. Lets assume you always get a profit share.
Crunching the numbers in profit calc
https://whattomine.com/ with custom built 170W@57Mh/s system - I will get 0.005 ETH per day, which is 1.61 CHF/day income but -1.65% mining fees so I will get 1.58CHF income.
Unfortunatelly, Swiss energy prices average 0.22CHF/kWh (neighbor Austria is not better, around 0.18€/kWh). 170*24=4.08kW*0,22=0.9 CHF cost of energy per day.
My profit is 0.68 CHF/day or ~ 20 CHF / month, which pays off GPU in more than 20 months :-D
My workstation PC currently mines 57Mh/s EHT and 15kH/s XMR @ 360W :-D
ETH +1.58
XMR +1.19 income (1% devfee + minexmr seems to have no fee >2 XMR)
energy -0.9
NET PROFIT ~ 1.8 CHF/day or 56 CHF/month
It is of course not sustainable because hashrate is always lower and lower.
Theoretically, my CPU and GPU would pay off in more than 18 months. With access to cheap hydro energy for 0.12€/kWh it may be more interesting and I would get around 100€/month....but that is just a dream ;-)
Did I get reality correctly or did I miss something, please?