At stock speeds a cpu will be happy in the mid/high 50C range for years....think of an OEM PC with a retail cooler packed with dust bunnies and cat hair.
HTPCs usually don't have high cpu utilization either, if setup properly (i.e. hardware acceleration for most decoding/encoding duties) so it will be frequently idle/near idle.
Low temps are important to maintain stability when pushing the limits of a chip at high Vcore and clock speeds.
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