while it's true that you won't need to reformat, snowgoer is right. i have an asus board that supports am3 processors, but needed a bios update to be able to use the 6 core am3.
Yup. Thanks! Sorry. I forgot to post my mobo and the processor. It's Gigabyte's Ga-790fxta-ud5 and phenom II X2 550 3.7ghz. I'm planning to upgrade it to an x4, x6 or wait for the bulldozer. Guess I need to update my bios if I'll go for an x6..