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 = $13.86month
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.

  

Hello, i have a strange problem. In device manager i see all my 6 cards(rx480 8gb) but radeon detects only 5 and it mines with 5. Any idea? The card is working since it was mining without any problems before i preinstalled windows. I will appreciate any help. Thanks in advance.

37.58.117.214 doesn't work

Yes, the newer version of Claymore does use about 5% more power, but also gives around 5% more sols, so it's about even in that regard.

The thing is, when keeping settings the same you can switch from ETH to ZEC and notice about a 10% power drop with no other effort as has already been mentioned, but if you make a custom ZEC WattTool profile you can drop another 10% off this as ZEC will allow you to drop the wattage more than ETH will without crashing. So it is a bit more work, but I modified my launch batch files to run WattTool with GPU initialization files customized to ZEC for lower power and another customized for ETH.

@yun9999 lol 5 cents per kwh is probbaly cheaper or on par with some US mining farms get.  I can tell you 90% of miners wheo are not farm owers are paying at least double
your rate which makes dual mining a losing prop

Hence why I said it's on a case by case basis and we shouldn't make a general blanket statement that it's not worth it.  It may or may not depending on your electric rates, heating cooling need, GPU and ROM.  Even at 10 cents kw, it's still profitable with my example.  Rather than say it's not worth it, we should provide examples where it is and where it isnt.   I stop dual mining with my 290 and 390 at these low Sia rates as it's not just the power cost but it also very taxing on the GPU with the very high heat.   That's another factor to consider where the extra stress on the GPU, SATA cables, PSU, etc can make it a losing proposition that people may not be aware of.  When Sia was paying double or triple the power cost, itw as worth the risk.   For the RX470, dual mining still run very cool and it doesn't even break a sweat.  

V2.0 killed one of my rigs:S I think CPU dead and 2 gpu dead:( sad sad day!

ETA for new miner ? 2.0 works fine with my r9 290, got around 10% hashrate increase but crashes my pc with r9 280x.