Thanks for your answer. It is good when you understand why things are happening. You don't feel yourself so helpless when you do:)
I hope NiceHash miner will soon have an ability to apply overclocking settings individually for each algorithm. There is such an option in settings but NiceHashSupport said it is currently not working.
NiceHash automatic algorithm switching is very helpful but my pc often hangs after switching from equihash because oc settings optimized for it aren't suitable for another algorithms, so I have to mine equihash only.
I think this is a "must have" feature for such a comfy miner.

Have someone noticed gradual profitability/payrate decrease last week? On my GTX 1070 rate fell from ~0.0022 to 0.0015 BTC/day for now, in $ it fell respectively, though I still do ~440H/s with excavator. Is this problem global?

Hello. I've had average global rate minimum of 0,0022 BTC/day with my GTX 1070 less than week ago. Now it is 0,0017 and falling further. In a current moment it is 0,0015. Frustrating.
And there were no significant drops of both ZEC and BTC for last 1 month. Can someone explain why this is happening?

Seems that I'm getting close to what I want my equihash mining in excavator to be.
Currently I'm getting ~440H/s with ~120W power consumption with my GTX 1070, but I'm overclocking it with MSI Afterburner and when NiceHash miner switches to another algorythm I often get freeze with "lost connection to GPU" in afterburner, "no CUDA device" or something like this and another errors in miners. And then I need to reboot in order to make it continue mining. Last night this thing happened again and my PC worked for 7 hours without any profit. So I came to conclusion that I need to find proper OC settings for each algorythm in order to make mining safe and stable.

NiceHashSupport, can you help me please with settings for NiceHash miner?

Putting this in start_equihash+restart_script.bat file seems to work well:
%DEBUG_MODE% -ca -ca -ca -os 0 150 780 53 -or

As I understood, number of -ca means number of threads, -os enables overclocking (with parameters after it) and -or means reset overclocking when exiting miner.

But it doesn't work when I'm running NiceHash Miner application. I also pasted this code to "extra launch parameters", but without any result.
Is there any guide what settings to put in "extra launch parameters" of NiceHash Miner? Or can you tell me what parameters I should paste there?
And, by the way, do you think my parameters are good for GTX1070? 53% TDP gives me ~120W in excavator. It is sad that when I'm trying to raise my core clock higher than +150MHz it usually ends up with errors, while I can still raise up memory by +900MHz in excavator while using equihash algorythm.
Thanks in advance.

I think they call this a "sweet spot" because, according to calculators, this configuration maxes out your profitability per day/month/year.
Look at my calculations:
https://www.cryptocompare.com/mining/calculator/zec?HashingPower=440&HashingUnit=H%2Fs&PowerConsumption=150&CostPerkWh=0.07
This are results at so called "sweet spot". Power consumption is set at 150W because during mining my UPS shows 25% load with maximum load 600W.
https://www.cryptocompare.com/mining/calculator/zec?HashingPower=353.3&HashingUnit=H%2Fs&PowerConsumption=138&CostPerkWh=0.07
These are results when I try to achieve 4-4.2H/W efficiency.
As far as I calculated, you get a little bit lower profitability per day/month/year if you try to max out efficiency for hash per watt to achieve 4-4.2H/W.
I think this happens because:
1) Your PC, excluding GPU, consumes certain amount of power while mining anyway, this variable is more or less the same and you need to keep this in mind while calculating profitability.
2) The more H/s your GPU makes the more money you get, so you have to find a spot with the H/s as close to maximum as it could be with minimum possible GPU power consumption but not maximum efficiency due to excavator.
OR
1) You really must achieve the best efficiency, but you need to calculate it according to total power consumtion of your PC, not only consumption of your GPU.

Hello everyone. I have MSI GTX 1070 Gaming X, and I decided to try some mining. Chose the easiest way to begin - downloaded NiceHash miner.
I'm currently mining equihash with excavator. In two words, I started to think if there is a way to lower power consumption without any critical mining speed reduction. Then I paid attention to "efficiency" parameter in excavator. So I decided to google some information about it and found an interesting article - Looking For The Efficiency Sweet Spot of GTX 1080 Ti, where author says that with greatly reducing Power Limit (TDP) you get almost the same speed with much lower power consumtion, less heat and noise.
And then I started to try different GPU settings in MSI Afterburner. By the way, I've got efficiency something about 2,4-2,7H/W with default settings.
My first parameters gave me:
Efficiency: ...................4,05-4,2H/W
Consumption: ..............84-87W
Speed: .......................344-360H/s
Temperature: ...............59C
Fans: ..........................28%
Good efficiency, but not the best mining speed.
To achieve these results I set memory frequency in MSI Afterburner to minimum (it lowers power consumption for several watts) and boosted core frequency (again, it somehow reduced power consumption a little bit).
But I discovered that when you start miner GPU rises core frequency (switches to boost frequency). That was the reason why my card switched between 98W and 152W power consumption rose a lot, strongly lowering productivity.
As i managed to find out, this happens when "utilization limit" or "no load limit" parameter in Afterburner switches from 1 to 0. When this thing happens it means your GPU decides it is loaded heavily and needs to boost up frequency. It becomes faster, but consumes a lot of electricity. So I tried to find a simple way to switch it back to base freq - all you need is to open your browser and try to search something in google. When card switches parameter back to 1 you can minimize browser window:)
...
My second parameters gave me:
Efficiency: ...................4,05-4,2H/W
Consumption: ..............~95W
Speed: .......................~394H/s
Temperature: ...............61C
Fans: ..........................30%
This time I tried to overclock memory. Set slider for +705MhZ, with memory clock 4514MHz. Mining stabilised at ~394H/s and 95W with 4.0-4.2H/W efficiency without any temperature rise.
I also tried to look if anything happens if I set power limit in Afterburner back to 100%. Nothing happened, gpu power consumption still showed the same 40-41%.
I also set core clock frequency slider to +139MHz. While "utilization limit"/"no load limit" parameter showed 0, core clock showed default base frequency 1582MHz. At the same time, GPU-Z showed me base freq at 1721MHz and boost at 1911MHz which are very high values with small chances for gpu to work at.
Trying to visit some heavy sites during mining, or simply trying to start a game makes "utilization limit"/"no load limit" parameter change to 0 and frequency rise above 2000MHz which causes miner restart or driver crash.
Does anybody know a way to lock "utilization limit"/"no load limit" at 1 or turn off GPU boost?
I also tried to max out GPU performance.
These are results with "utilization limit"/"no load limit" at 1:
Efficiency: ...................~4H/W
Consumption: ..............~95W
Speed: .......................384-390H/s
Temperature: ...............61C
Fans: ..........................31%
These are results with "utilization limit"/"no load limit" at 0:
Efficiency: ...................~2,5-2,6H/W
Consumption: ..............~180W
Speed: .......................~459H/s
Temperature: ...............71C
Fans: ..........................55%
Power: ........................74-78%