The 900 series is not really worth using but since you pay nothing for elect I City you might make a few bucks over the month. All depends on your hash rate and what pool you’re in. My gtx 1080 pulls about 20mhs and at the current price that’s close to 60-70 dollars a month.
1080 isn't as good as the 1060/1070 due to the type of memory used. Excellent for gaming, not quite the best for mining. I can probably get it up a little more if I overclocked but I'd rather not.
