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Having a mac I can tell you that absolutely it's worth your money to go in and have the damn thing cleaned inside and out at least once a year (if you can't do it yourself which with some of these models isn't very easy at all). It will save your fans lifetime and will keep your cpu cooler.
Macs unfortunately are great looking but the whole slim and compact design isn't great if you're going to use it as a gaming machine as keeping vents clean can get to be a nightmare.
All that being said, iMacs will run hot as a default though 89C is very very hot and at 90C my cpu is designed to shut down. You gotta take that in to get looked at before something fries.
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