your gonna have to re install, just backup the files you want to keep, and the 880G chipset, why not go for the 970 or 990FX instead
I have a micro-ATX and the highest chip set they have is an 880 at the moment. I would love to use standard ATX and get the features and my computer "should" take it but the model was made with m-ATX even though the case is a full tower. I am using an LX-6200, but it is all upgraded.
For now I will settle with a budget mobo that will be sufficient until I just buy a new case that takes ATX (I could use a new one anyways)