The PSU seems to shut down when feeding it with just 2. It might be because the cables are made for just 75W and it pulls 180W through each (so it drains 360W in total).
So, I'm thinking can I plug a 3rd pci-e cable, without overclocking it just to spread the power a bit more, or it doesn't work like this?
the power usage is separate per side so the 3rd cable would just help distribute the power load on that one side. i'm not affiliated with minersource (
http://minersource.net/products/dell-750w-psu-slash-adapter) or gekkoscience (
http://www.gekkoscience.com/products/D750_supply_breakout_board.html) at all but i've purchased several of these products and they are prob the best use of your $ if you are going to run S1's, S3's, BTC Gardens, etc.
yes looks like much cheaper solution. My question is why everyone is using ATX PSUs then?