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So i have a late 2009 21,5 iMac and whatever i do it's sooo hot! Like right now just typing this or watching youtube it gets up to 50 degrees celsius... It does not get any hotter than that and i'm not running any specific programs that are big. I have SMC Fan control but just asking should it be that hot? I know the aluminum case works like a heatsink but really 50 celsius hot???

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    How are you determining the the specific temperature? Also, can you provide a screen capture of Activity Monitor? You can also issue the top command in Terminal and paste the output to your original question. – Allan Mar 3 '16 at 13:33
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    What is telling you this temperature? Are you applying a thermometer to the outer case or are you using software to monitor the temperature sensors? This temperature is entirely normal, by the way. This page discusses temperature and Mac quite adequately. – IconDaemon Mar 3 '16 at 13:37
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    That's the CPU temp. Since I don't know exactly which CPU you have, I can't give you an exact answer, but Core2Duo CPU's generally have max temps in the 70C, so your CPU is not too hot. See this site: ark.intel.com/products/family/79667/… – Allan Mar 3 '16 at 13:44
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    Please be kind a flag the comment as helpful (You may also want to "answer your own question" – Allan Mar 3 '16 at 13:51
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    Hover just to the left of it...you will see an arrow and a flag. Click the arrow! – Allan Mar 3 '16 at 14:26
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The 21.5-inch, Late 2009, iMac has either a E7600 or E8600 Intel Core 2 Duo with a TCASE (Case Temperature is the maximum temperature allowed at the processor Integrated Heat Spreader (IHS).) temperature of 74.1°C and 72.4°C respectively. So if the CPU is reading only 50°C, then it's not running hot at all.

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