Hi I'm building a system at the moment and I'm deciding on a motherboard. I've chosen one that's ticked all my boxes and looks very good nForce 750i SLI 775 ATX Motherboard (it's conservative but what it has is good). It needs a 24 pin power connector and the PSU I'm going for has a 20+4 connector. I've read around and it seems you can plug a 20+4 pin into a 24 pin, is it disadvantageous doing this or dangerous? Or do I need an adapter?
As MAT ALAN says, the only reason power supplies come with a 20+4 connector is so that it can be used with all motherboards regardless of whether it needs a 20 pin or a 24 pin power supply connector.
If the power supply manufacturers didn't do this then they would need to supply 2 different power supplies, one with 20 pin and one with 24. This way they only have to make one power supply with one connector that can do either motherboard.