I was curious because I had found this post on another website:
"Use 20 Pin ATX Power Supply on MB Requires 24 Pin
Is that possible?
Yes. As long as pin 1 on the 20 pin power connector align up with the pin 1 on motherboard 24 pin power connector. Same apply to the ATX12V AUX connector, as long as its pin 1 on the four pin connector align with the pin 1 on the six pin connector on the motherboard, they should work."
I ordered an Enermax 365p-ve fca PSU and didn't bother checking my motherboard first (oops!) and I think that this PSU has a 20 pin connector.