Enermax 470W not have enough pins for NF4?

I've got a Enermax 470W Noisetaker on my NF7-S right now. I'm going to be upgrading to either MSI or DFI nforce4 ultra soon. I noticed that those boards have a 24-pin slot for main motherboard power, and this PSU only has 20-pins. Do I hafta buy a new powersupply!?

I found out that I could either use a 20-24pin adapter or just plug it in directly to the the mobo and leave 4 pins empty. If i'm only overclocking to about 2.5-2.6ghz on my winnie and using only 2.8vdimm, would that be safe, or should I really consider getting a 24pin PSU?

Whatever you do, don't use the an adapter, it is known to only cause problems.

If i'm only doing a mild overclock, would it be stable and safe enough?