computer heats up when used
Computer heats up when used ND Fn comes on
MacBook Pro 13″, OS X 10.10
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I don't know what ND Fn is, but yes – a modern Mac is a lot of computing power in a small package, and when something is using a fair bit of computing power, the Mac will get warm.
See how apps affect Mac performance, battery runtime, temperature and fan activity – Apple Support
