First of all, do not use SATA. Use either molex or PCI-E. I suppose there is one card now, when you will have more, I think you should go for a modular PSU.
No I am gonna power 12 1050ti with 2 Antec Classic 750W (non-modular, gold). I will start slowly of course, one by one, observing and learning.
of 750w is 600w available power. Max tdp of the 1050 Ti is 75 ( x 12) = 900w and that isnt even including the motherboard, cpu, ssd, etc. You are going to have to spring for a larger power supply and I would get a modular. All of mine are.I said I am gonna use 2*750W PSUs i.e. 1500W or 1200W at 80 %