Yeah, My motherboard needs a 24 pin but I have a 20 pin 450 watt psu, It all counts on the voltage, 12a example, My Motherboard basicly needs 24 pin or if you don't have one, look at the side and mine said if that's the case make sure 12a/15v or above and my Voltage for 12a was 20 so it works perfectly.
So try look to see what 12a voltage you have on the PSU