You're right why not 0.001 btc if powerful gpus are out of reach? Of course 1080ti would be great because as difficulty rises it will be used for many years and profitable as well. I think 1050ti can be used for 1 or at most 2 years then it won't bring any profit.
What I want to ask is how is it possible for the same gpu to bring twice the earning in a more powerful system? The important component is gpu. Others are just there to let it work. Maybe your old psu did not give enough electricity to the gpu? It worked but could not work effectively is it possible? What do you think?
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It is possible that is was only the PSU holding back the GPU. I will find out when I replace the PSU in the Cheapo system. The conditions under which the cheapo system was ideal (with the exception of the PSU) to be getting the max hash out of the system. It was a single card that was well within the rated power of the system. The card was in an atmosphere where the ambient temperature never exceeded 2 degrees C and the majority of the time the temperature was well below 0C. The things that make me wonder is the card still ran slightly over 40C and hashed lower than it did while it was in the 7th gen intel chip. The reference to 0.0001 btc was per day. I am not sure if a single GTX 1080ti could make 0.001 Bitcoin a day. That would mean it is earning 8 dollars a day at 8K. The most I have heard a single card making is closer to 6 dollars a day and I believe that was with Bitcoin at closer to 10k.