Hey, I'm going to do the exact same thing. Have you actually seen a Phenom 9100e for sale? AMD says it will only be a system builder part. I hope this isn't the case, but we'll see.
Anyway, to your question. I've never used an AMD stock cooler, however, since this is only a 65W part the fan shouldn't have to be too robust, so I imagine it won't be excessively loud.