That was the one thing I f'd up on when I ordered my parts and got a 24pin mobo with a 20pin psu. I have been runing it so far without an adapter, so yes it works. I still plan on getting one just haven't gotten my lazy *** to do it yet. My manual said it "wasn't recommended." But didn't say DON'T either. So, I don't think your risking anything fatal.
BE HEARD - Techonvent
DS3 | E6400 - 3.2GHz 24/7 | 2GB OCZ PLat. PC6400 | 6800GT | Zippy 460W
What the world needs is more geniuses with humility, there are so few of us left.