Almost is a bit loose of a term ... if you have a 24 pin ATX on the PSU and a 20 pin on the mobo and no adaptor.... then its not much use to ya.The type of motherboard is almost irrelvent
Then you can eitherbut what about if the PSU doesnt have a sata power cable for the sata hard drive.
the 24-20 adapters just remove the 4 wires from the end, at least the ones I've seen do. Although you probably can't plug the 24 into a 20 without the adapter becuase of the thicker plastic on the outer edge of the motherboard connectorAlmost is a bit loose of a term ... if you have a 24 pin ATX on the PSU and a 20 pin on the mobo and no adaptor.... then its not much use to ya.