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We have one of each, the original C2D lines, and there is certainly not a huge difference. I have the fans on my MBP set a little more aggressively, but all in all they are both very quiet laptops.

The can sound like harriers when they really get going, but for normal every day tasks they are both quiet relative to their PC siblings provided by our employers...
 
The thing is, I really need a number. I'm going to use it for recording sound, and believe me, rooms that people say are quiet, in actuality - aren't.
 
If you're that keen on having perfect sound quality for whatever reason, I'd say go with the MBP just for the added performance.
 
What added performance? Marginally faster CPU isn't enough to warrant the price jump. Also, I'm using an external Eizo display, so the screen is rather irrelevant. I also fail to see how performance is going to affect sound quality.
 
macbook pro's are aluminum and thus dissipate heat better, thus requiring the fans to work less.

I do a lot of recording on my powerbook and it would be really annoying if the fans kicked in, so I downloaded a fan control app to prevent this.

mac's are quieter than other laptops.
 
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