I think when the dust settles, ETH will be maybe 10% more profitable then ZEC due to the fact that it uses less electricity.
eTH uses less?
No it doesn't, this statement is wrong. Mining Eth absolutely uses more power than ZEC with all clocks and voltages the same.
As for dual mining, I concur with the fact that solo mining Eth is more profitable. You actually lose money mining SIA or DCR as the extra electricity cost is more than what you mine.
First part is correct, Zec mining uses much less wattage then Eth solo or dual. We should avoid General blanket statements like Dual mining is not worth it. It all depends on your GPUs, ROMs, and electric cost.
My Example
RX470 (Mod Rom) x 7 GPU Rig on MSI Gaming 5 with Celeron CPU
Eth mining solo - 130W - Even less with undervolting
Eth dual mining Sia - 165-185 watts depending if undervolting or not
Wattage difference is 35-55w x 7 GPU. We will go with the higher end at 55w x 7 = 385
Electric cost at 5 cents per kw for this 385w power difference = $13.86 /month
Dual mining with -dcri 22 gets 300 Sia per GPU. 7 x 300 sia = 2100 sia gets $28 / month right now. So basically you're getting $14 profit a month on Sia. For my RX470 mod ROM, I actually get .7 Eth Hash faster per GPU mining dual vs solo so that's another almost 5 MH free per rig which is another $13/month free.
Total extra profit a month = $27/month plus free heat. Again it's all on a case by case basis, dual mining may not make sense for GPUs such as 290s, etc where the wattage draws are just ridiculous.
