Re: Power Supply...uhh...not really problems...but problems
The motherboard has that extra 12V plug there for a reason though so I'm thinking you have to use it or your computer won't run properly. Otherwise, what's the point of adding the little 4-pin plug in the first place? If your power supply is a piece of crap, invest a newer one with the 20+4 pin for your AMD motherboard. Otherwise, go for the adapter.
*Fact: Microsoft Window's Blue Screen of Death vs Computerforums.org's White Screen of Death. Which is worse?