Well now the question is, can I just plug that 750 in my Optiplex 780 and go without a higher wattage power supply, and do I really need an extra 2gb RAM that would come from that 1x4 card (I have 4gb RAM btw)...? I have the room AND extra cords coming out of my PSU that I assume are for whatever you would want to plug into the PCI slots... But I am not sure if I really have any wattage to spare....