A heat sink attaches to the CPU/GPU chips and transfers heat through a heat pipe to heat radiators located at the fan exhausts. A primary cool air intake is located at the center of the rear vent (between the two exhaust vents). The 15-inch MacBook Pro with Retina Display includes two large cooling fans that exhaust hot air out at both ends of the rear vent located under the screen hinge. The laptop’s active built-in cooling system is the laptop’s primarily method of cooling. The Silence Adapter is an optional accessory for sound sensitive environments, it is not a standard accessory or required for typical office environments. I hope the following information helps clarify a few things: Note: MacRumors received no compensation for this review. The Silence Adapter is available for $8.95. The Svalt D is available in Silver and Black and can be purchased from the Svalt D website for $149.95. In our opinion, the Svalt D is a solid dock that lives up to its claims, keeping your MacBook cool when it's used with an external monitor. Luckily, both modes are relatively quiet and don't make as much noise as a MacBook fan, but the silent mode is definitely a better choice for users who want the quietest possible performance. There's a normal mode and a silent mode, but switching between them requires using a special standalone cable, which is a bit of a hassle and an extra expense. Our one complaint about the Svalt D concerned the two modes of the fan. With the stand, our video exported in 14 minutes and the stand kept the MacBook at 105 degrees Fahrenheit, a 16 degree difference. Without using the dock, exporting a video took 15 minutes and caused the temperature of the MacBook to rise to 121 degrees Fahrenheit. To test the Svalt D, we exported two different videos from a MacBook, with and without the dock. The Svalt D houses a small stand that moves air through a MacBook, and thanks to an adjustable rubber foot, it's compatible with all of Apple's notebooks. Made up of a two-pound block of aluminum, the Svalt D is an attractive, sturdy stand that matches well with Apple's line of MacBooks.
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