What is your "normal" CPU temp running just low load stuff like safari, a few office apps and Skype

nph

macrumors 6502a
Original poster
Feb 9, 2005
627
36
I am running more or less between 37-41C with minimum fan speed 2160 more or less.
My MBP is the base 2017 15".
 

dwfaust

macrumors 603
Jul 3, 2011
5,479
6,177
I can't say for sure, because I don't use Safari or Skype... but here's my info from iStat:

Screen-Shot-2017-06-26-at-7.31.45-PM.jpg
 

OldMacUser

macrumors member
Jan 10, 2011
56
1
Melbourne, Australia
TB MBP 13-in. Current apps running - Pathfinder, Safari, Chrome, Mail, Skype, Messages, Word, Preview.
Ambient air temperature is around 20C.

CPU Proximity: 40C
Intel GPU: 44C

Screen Shot 2017-06-27 at 1.10.26 pm.jpg
 

New_Mac_Smell

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Oct 17, 2016
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@nph I thought I'd seen a few threads you started regarding heat or noise, so I had a nose of your thread history. It seems that this concern is a very long standing one for yourself, did something happen to cause this worry?

I'm fairly certain nothing myself, or anyone else can say will alleviate this. But know that heat and energy are the same thing, it is physically impossible to consume energy without generating heat. And when heat is generated we need to remove it which is why there are fans, which generate noise again as they are a physically spinning device, which generates audible energy.

CPU's work using transistors, which require a constant source of energy to function. So even at low load they are generating 'heat'. However this is a small amount and can largely by overcome using solid state heat transfer mechanisms such as a heatsink, as opposed to removing heat through airflow transition, or using fans. Because of this, the computer will get warm before utilising any fans as this is a better and more economical use of available energy for the system.

Basically, and I'm looking at old threads to answer this. It is impossible to have a "Cool and quiet" computer when using transistor based CPU's. It will be cool and loud, or hot and quiet. Manufacturers will balance this so that the computer will get reasonably warm yet still remain quiet, as noise pollution is a more irritating factor than heat dissipation.

If you do very minimal tasks with a computer it won't consume as much energy and so will not get as warm, and the fans will not be necessary. But physically again, you'll always see some heat being generated.

I hope that provides at least a basic explanation, but I am curious why you are so greatly concerned by heat. Remember any computer will always shut down long before any damage is caused, and it needs to get very hot before this happens (Around 100'c it'll start to panic).
 

leman

macrumors G3
Oct 14, 2008
9,962
4,550
My 15" 2016 model is at 40 C right now. Which makes perfect sense considering the ambient temperature of 28 :D
 

joefoong79

macrumors regular
Jun 23, 2017
168
31
@nph I thought I'd seen a few threads you started regarding heat or noise, so I had a nose of your thread history. It seems that this concern is a very long standing one for yourself, did something happen to cause this worry?

I'm fairly certain nothing myself, or anyone else can say will alleviate this. But know that heat and energy are the same thing, it is physically impossible to consume energy without generating heat. And when heat is generated we need to remove it which is why there are fans, which generate noise again as they are a physically spinning device, which generates audible energy.

CPU's work using transistors, which require a constant source of energy to function. So even at low load they are generating 'heat'. However this is a small amount and can largely by overcome using solid state heat transfer mechanisms such as a heatsink, as opposed to removing heat through airflow transition, or using fans. Because of this, the computer will get warm before utilising any fans as this is a better and more economical use of available energy for the system.

Basically, and I'm looking at old threads to answer this. It is impossible to have a "Cool and quiet" computer when using transistor based CPU's. It will be cool and loud, or hot and quiet. Manufacturers will balance this so that the computer will get reasonably warm yet still remain quiet, as noise pollution is a more irritating factor than heat dissipation.

If you do very minimal tasks with a computer it won't consume as much energy and so will not get as warm, and the fans will not be necessary. But physically again, you'll always see some heat being generated.

I hope that provides at least a basic explanation, but I am curious why you are so greatly concerned by heat. Remember any computer will always shut down long before any damage is caused, and it needs to get very hot before this happens (Around 100'c it'll start to panic).
As OP mention he was asking 36c-41c at 2100rpm is that normal. So seem all reply here seem not normal, but fan running at that speed will basically nothing to worry because will absolutely not frying the CPU which running all time. Only tear and wear of fan faster.
 

New_Mac_Smell

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Oct 17, 2016
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As OP mention he was asking 36c-41c at 2100rpm is that normal. So seem all reply here seem not normal, but fan running at that speed will basically nothing to worry because will absolutely not frying the CPU which running all time. Only tear and wear of fan faster.
At idle the computer will be around 40'c and at idle the fans will spin at around 2000rpm. That's what's been shown and that's what's normal.

Looking at the screenshots people have provided they are using iStat Pro, and are showing fan speed as "0 RPM". Which would indicate that it is not reading the fan speed. I believe you need to instal a plugin such as http://www.hwsensors.com/releases in order to read this data.
 

ilian92

macrumors regular
Oct 7, 2012
163
106
Fans at 2000rpm are borderline silent. I can barely hear mine at all. 40C-45C are my regular idle temps as well, which is perfectly normal. Under heavier load it's floating between 80C - 95C and fans on max speed. The 95C are a little too high for my liking but it is what it is, I haven't found a functional way to shave some of that off.
 

joefoong79

macrumors regular
Jun 23, 2017
168
31
At idle the computer will be around 40'c and at idle the fans will spin at around 2000rpm. That's what's been shown and that's what's normal.

Looking at the screenshots people have provided they are using iStat Pro, and are showing fan speed as "0 RPM". Which would indicate that it is not reading the fan speed. I believe you need to instal a plugin such as http://www.hwsensors.com/releases in order to read this data.
MacBook Pro 2017 and 2016 fan will not kick in around 45c or higher. Even it run will be around 1200rpm until it kick up to 60c at 2000rpm. Check one in Apple Store. You talking is the 2015 rMP will be act like that but not newer version.
 

New_Mac_Smell

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MacBook Pro 2017 and 2016 fan will not kick in around 45c or higher. Even it run will be around 1200rpm until it kick up to 60c at 2000rpm. Check one in Apple Store. You talking is the 2015 rMP will be act like that but not newer version.
Where have you gotten that information? Everything I'm finding tells me they run at 2000rpm (Min) by default, my MBP is set to 2000rpm and I haven't touched anything.

Screen Shot 2017-06-27 at 17.14.11.jpg

I believe the minimum you can manually set it to is 1200rpm, but they definitely aren't switched off until 45'c or anything.

P.s. I can't believe I had to download an App called 'Fanny' for this o_O

Screen Shot 2017-06-27 at 17.10.02.jpg
 

joefoong79

macrumors regular
Jun 23, 2017
168
31
Where have you gotten that information? Everything I'm finding tells me they run at 2000rpm (Min) by default, my MBP is set to 2000rpm and I haven't touched anything.

View attachment 706051

I believe the minimum you can manually set it to is 1200rpm, but they definitely aren't switched off until 45'c or anything.

P.s. I can't believe I had to download an App called 'Fanny' for this o_O

View attachment 706052
Not setting anything. The app call istats. At default is off. It mean you not manually adjust anything at all. Used Mac system configuration the fan as default not istats. I don't know why your mac start at 2000rpm even when start. But all MacBook Pro 2016 I touch before the fan will only start atleast 45c or higher at 1200rpm then until you reach high at around 55c-60c will be 2000rpm.
[doublepost=1498581922][/doublepost]If the temperature get back below 40c of certain amount of time of cool down then the fan will shut off again until it reach back that high temperature again will kick off.
 

New_Mac_Smell

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Not setting anything. The app call istats. At default is off. It mean you not manually adjust anything at all. Used Mac system configuration the fan as default not istats. I don't know why your mac start at 2000rpm even when start. But all MacBook Pro 2016 I touch before the fan will only start atleast 45c or higher at 1200rpm then until you reach high at around 55c-60c will be 2000rpm.
[doublepost=1498581922][/doublepost]If the temperature get back below 40c of certain amount of time of cool down then the fan will shut off again until it reach back that high temperature again will kick off.
So after some testing, all after a restart with nothing open. And I'd still appreciate if you have some kind of report on the default RPM that shows otherwise.

Sitting below 40'c for 10 minutes:

on power.jpg


So I thought maybe it's the battery, so sitting on battery below 40'c for 10 minutes:

on battery.jpg


And finally checking within istats:

Screen Shot 2017-06-27 at 18.10.00.jpg


Absolutely everything I can find points to 2000/2160RPM as default. The only comments I am finding are discussions that suggest there are bugs or errors with software such as iStat however.
 

joefoong79

macrumors regular
Jun 23, 2017
168
31
Stop worrying too much about the fan. Just enjoy your MacBook. If it stop working it will eventually stop, nothing much you can do. Fan stop running worry and now fan keep running also worry. :eek:
 

New_Mac_Smell

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Stop worrying too much about the fan. Just enjoy your MacBook. If it stop working it will eventually stop, nothing much you can do. Fan stop running worry and now fan keep running also worry. :eek:
? I'm not worrying at all. I told the OP that the fan/temp was normal and you said it wasn't. I was trying to get you to supply some kind of evidence as to why it wasn't normal.

As I said, everything points to 2160RPM at 45'c to be absolutely normal. They should be spinning at 2000RPM.
 

joefoong79

macrumors regular
Jun 23, 2017
168
31
time 7.19pm using 20 tabs safari, online streaming movie and playing diablo 3 on 2 monitor all at once the temperature at 66c fan kick off 1992/1849 rpm. after 3 minutes close game diablo 3 and just streaming movie and safari. At 7.32pm. overall 13 minutes temperature back down to 41c and fan will back to 0 rpm
 

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New_Mac_Smell

macrumors 68000
Oct 17, 2016
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time 7.19pm using 20 tabs safari, online streaming movie and playing diablo 3 on 2 monitor all at once the temperature at 66c fan kick off 1992/1849 rpm. after 3 minutes close game diablo 3 and just streaming movie and safari. At 7.32pm. overall 13 minutes temperature back down to 41c and fan will back to 0 rpm
Which version of iStat are you using? There's a known bug where it displays 0RPM when idle, and only displays actual RPM when the fans speed up. Try reinstalling/updating or running istats directly from terminal. If your fans really were running at 0RPM the CPU would very quickly gain heat, and then the fans would be spinning up constantly.