Going from the factory Dell not even certified power supply I went to a Bronze 750W by Corsair. Then when I got into mining I grabbed a Corsair RM1000 Gold and a Corsair HX850i Platinum. Thinking about grabbing a few more Corsair RM1000's at $100 a piece, but thought I'd ask what everyone else uses.
Single EVGA 1600? 1300? Dual 1000s? Dual 750s?
Also, even though Platinum power supplies are more efficient, I've heard that they aren't worth the price difference vs Gold power supplies. Do you feel the same way? All mine are running on 110V currently. Will switching to a 220V make that much more of a difference?
How do you determine when your power supply is maxed out? I know that you should keep it under 85% of total wattage for longevity, but what about for PCI connectors? For instance on the Bronze 750 I have, I could run one of my 290s on it, but what if I wanted to add one of my 390s? Each card says it should have a minimum power supply of X, but as long as you have enough PCI connectors and the total draw stays under the max will it be fine?