Yeah, I was worried a 1k was going to be the answer..
What would you suggest for running 3 and also 4?
I'm just trying to get an idea of the range between them.
I see what they pull, but If I go by that, a 750 will only run 2.
Thanks!
Just go with the 1000 Watt PSU. Then you won't have to get a new one when you get more GPUs. The difference is only about $100, which is nothing compared to the cost of GPUs. Also, PSUs last for a very long time, so you can just keep using it almost indefinitely.
Also when it comes to mining, a 600 Watt PSU will have trouble running a single card (can crash easily). So 750 Watt would be pretty close for 2 cards or more.