what settings you have there? but 6900kH/s is low
I see if my CPU i7 7700 is use like 20-30% (for example let the Suqa Wallet to do some cpu mining) I get 8000kH/s
If your electricity rate is low you can go with bad kh/w
In my case, if I was using your setting I would make 1.76$ with 10 cards (i have 24) but with my setting i make 2.47$ once electricty is paid with a rate of 0.1525$/kwh
At a rate of 10c/kwh with my settings I would still make more.
The break even point is between 0.07 and 0.08c/kwh
My settings are 0.6375v +400 core -600 memory with nvinspector