Here is my situation. I am building a computer, and right now only have the case. After I hooked up the fans (1x 120mm, 1x 80mm, 1x 140mm), the computer wouldn't start. All the fans would make about 1/4 revolution, and that is IT. I know that it is the PSU because it's only a $20 400w supply. I am going to need a new one anyway, due to the new components that I am looking at, but I wasn't expecting it to be this soon. The current estimated wattage is 313w, but with 2-way SLI it comes to 513. Will a Corsair CX Series Modular CX600M be enough to have 2 GPU's later on? Or should I get the 750w one? Again, I need to get just the supply this week, and the other components will come sometime after Christmas.
Thermal and Power Specs:
98 C - Maximum GPU Temperature (in C)
230 W - Graphics Card Power (W)
600 W - Minimum Recommended System Power (W)
One 8-pin and one 6-pin - Supplementary Power Connectors
600 + 230 = 830 minimum .... bigger if overclocking
As for the modular thing.....modular provides no advantage and some disadvantages. No sense in making a cable modular if it absolutely must be used. All it does is add another failure point an extra resistance / cost.
Most quality PSUs are what's called semi-modular. All the cables that absolutely must be used are hard wired....all the optional ones are modular.