yes, you are right. Without I said it explicit, I use minergate and yesterday I found out, they stealing a huge amount for the withdrawl and secondly they are -40% inefficient than xmr-miner. But with my windows 7 I have some sorts of problem setting up some miner. Often they are working incorrectly. Anyway. I read also if you run them on 7 cores you got 10% more energy than with 8 cores.