imac 27 2017 i7 7700k temp hits 100 under cpu burn test

paukivbashne

macrumors member
Original poster
Sep 16, 2012
90
7
Ukraine
So as stated im having 100 C on my cpu (i7 7700k) Imac 27 2017
THis is under heavy cpu load on all cores ( i used this command to stress test cpu -
yes > /dev/null & yes > /dev/null & yes > /dev/null & yes > /dev/null &)
I have never had this high temps on my previous Imac ( 2012 -2015 had all of them) or any other device. I always tought this is the temperature of overheating CPU.
so my question is - is it normal for i7 7700K? can anyone test this on their imacs?
these new macs seem much hotter and noiser then previous generations....
 

niteflyr

macrumors 6502a
Nov 29, 2011
936
147
Southern Cal
So as stated im having 100 C on my cpu (i7 7700k) Imac 27 2017
THis is under heavy cpu load on all cores ( i used this command to stress test cpu -
yes > /dev/null & yes > /dev/null & yes > /dev/null & yes > /dev/null &)
I have never had this high temps on my previous Imac ( 2012 -2015 had all of them) or any other device. I always tought this is the temperature of overheating CPU.
so my question is - is it normal for i7 7700K? can anyone test this on their imacs?
these new macs seem much hotter and noiser then previous generations....
Very normal. Don't worry. I see it during encoding everyday under heavy CPU load.
 
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priitv8

macrumors 68040
Jan 13, 2011
3,587
454
Estonia
Especially, if you run in Turbo Boost mode, your CPU will hit the water boiling temps.
Happened also on my 2013 MacBook Pro with quadcore i7.
I tend to disable Turbo Boost on my Macs in everyday use.
 
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paukivbashne

macrumors member
Original poster
Sep 16, 2012
90
7
Ukraine
thanks for replyes guys.
what wierd is that my previous mac had 6700k and it was much cooler. And according to intel cpecs both cpu's got 91w tdp.
i even reapplied thermal paste and checked the the cooling fan.. nothing changed
 

SF6

macrumors newbie
Jan 27, 2020
10
4
It's unfortunately normal for these i7 7700K inside the iMac. The current i9 9900K and i5 9600K are much better. Fans won't spin higher than 1800 rpm under load.

I guess it's the TIM in conjunction with high clock rates. i5 8500 also gets rather hot inside the iMac albeit not as hot as the i7 7700K.

I tested them all under full load (Cinebench R20):
i7 7700K, 2700 rpm, ca. 98-100°C
i5 8500, 2250 rpm, 95°C
i9 9900K, 1800 rpm, 90°C
i5 9600K, 1200-1400 rpm, 85°C
 
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_Skyfire_

macrumors member
Aug 16, 2017
64
30
It's unfortunately normal for these i7 7700K inside the iMac. The current i9 9900K and i5 9600K are much better. Fans won't spin higher than 1800 rpm under load.

I guess it's the TIM in conjunction with high clock rates. i5 8500 also gets rather hot inside the iMac albeit not as hot as the i7 7700K.

I tested them all under full load (Cinebench R20):
i7 7700K, 2700 rpm, ca. 98-100°C
i5 8500, 2250 rpm, 95°C
i9 9900K, 1800 rpm, 90°C
i5 9600K, 1200-1400 rpm, 85°C
Interesting. Should probably test my setup. I have understood that an i5 7600K would be significantly cooler than the i7 7700K
 

clystron

macrumors member
Aug 11, 2011
86
56
Have you checked your clock-speed under that load? 100°C is borderline for this CPU, it might be throttling already. If it is still going full speed you should be fine. The 7700k runs a little hot, I see around 80°C when running handbrake at 4.4GHz all-core with a massive air-cooler in my PC-rig at home and cpu stress-tests tend to cause more heat.
 
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