I know this topic has been discussed at length in other threads, but I've not found an answer to this particular question. Bought an MBP in February, and it had the famous CPU-whine. It was so loud that it was truly annoying. I took the computer to an Apple service provider and they changed the Logic Board. The sound has changed from being less of a whine to more of a 'crackling' however it still there. Speaking to the technician though, I got the impression that ALL MBPs have this sound, albeit in some (perhaps most) it is so low that it's not much of a problem, and in others it's really loud. Is this your impression as well?