Did the 09 Caad 9 come with a BB30 bottom bracket? It will have a BB30 sticker under the downtube if it did and the BB shell will not be threaded.

If it is threaded - and 09 may be - you are fine to use your old crankset and bottom bracket. If not, you will need to purchase one of Cannondale's conversion kits. It permanently converts a BB30 bottom bracket to a standard bottom bracket.