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Switcher Hangout The place for switchers to discuss their new machines, and how to work with OS X. General support can be had here for newbie stuff, like "How do I restart my new iMac?" :)

CPU Temp. and Fan Control


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OnceYouGoMac

 
Member Since: Dec 28, 2009
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Hi gang,
Without debating the acceptable heat range of a Mac, or the glitches of this or that lol, I have just a simple question that, if you would answer, would make me very happy and thankful. I have one of the new unibody white Macbooks (which I love btw). So, I use the program Temperature Monitor. At night, I run three highly processor-and-resource intensive applications, so that the Activity Monitor shows both cores at 100% for 8 or 9 hours straight, and the RAM is mostly wired. But, according to Temperature Monitor, the CPU temperature, in Fahrenheit, stays at a consistent 215F! The fan kicks on once in a while and gets it back down to 198F or so, but I am concerned about such high temps going for 9 hours at a time. I know Apple assures me this is normal, but just a basic knowledge of physics and thermodynamics tells me that a temperature that could boil water radiating out to all my parts for that long must be shortening the life of something somewhere lol. So, I got SMC fan control. I only use it in that one particular situation, and it definitely cools the CPU cores off to a much more reasonable level. So here is what I want to know:

cms fan control has an option to display the temperature, just like Temperatue Monitor does. I would like to just have one program doing that. In your OPINION and EXPERIENCE and any FACTS you know, is the reading from Temperature Monitor, or on CMS Fan Control, more accurate? Not trying to start a war, just wanted some basic information. Thank you! Merci!

It is not normal for a computer to constantly crash, freeze, and become infected by thousands of malicious programs. Microsoft has just convinced you that this is all normal.
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vansmith

 
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I don't know enough about electronics to comment on the continued exposure of heat to computer parts but what could you possibly be doing for 9 hours straight on a notebook that is that processor intensive? If you really have to do that every day, you should be looking at some other solutions.

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DarkestRitual

 
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WOW. That's too hot. Anything over 100 C (212F) should make you worry, because that will boil water...

Get a can of compressed air and please, blow that sucker out! Get a cooling pad!

I also use iStat menus. Pretty sweet, customizable UI.
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OnceYouGoMac

 
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Thanks for the thoughts. However, I was asking just one question: is SMCFanControl or Temperature Monitor more precise in its readings? Thanks.

It is not normal for a computer to constantly crash, freeze, and become infected by thousands of malicious programs. Microsoft has just convinced you that this is all normal.
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DarkestRitual

 
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Probably SMC, but I'll leave that to the experts
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Nethfel

 
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The Penryn CPU can go as high as 105c TCase (thermal reading at the case), but it shouldn't stay there really for any length of time. Your sitting at about 101c, which to me is a bit high for a system with proper cooling - but I'm used to the aluminum model which will stay at 90-91c at 100% usage with the fan going. What seems a bit weird to me is that your fan isn't staying on all the time with 100% usage on both cores - I know mine did.

In terms of which is more accurate - I can't answer that - I know that many times programs that supposedly read the temperatures from the same registers can report different values (sometimes it may just be because of the timing of the reads of the data itself can be different causing a difference in values) but if the two display within a couple of degrees of each other, I wouldn't worry about getting all technical about which is more accurate. If there is a huge difference then I'd be concerned.

IMHO - First do a comparison to see how far off the two temps are. If they are far off, I'd probably rather the one that is reporting high to use for figuring what to set SMC Fan Control to kick the fans on at. If Temp Monitor is showing the cpu at 100c and SMC Fan is showing at 91c then I'd probably use Temp Monitor as my guide at least for how I configured SMC.

Also: Onceyougomac: could you possibly correct your system info: Macbook Unibody 2.6 Dual, 2GB RAM, 250 GB HDD - I've checked all of the Macbook models, and none of them (outside of the pro line) offer a dual core 2.6GHz CPU - it makes it hard to figure exactly which system you have for questions like this to find the proper CPU version as different mobile CPUs can have VERY different max temp values (ie: <90c to >100c and which you have is important when determining what the max safe temp is).

My Macs: Late 2013 rMBP w/ 750m; Mac mini G4, 1.25 GHz, 512m ram (server); Late 2011 11" MBA, 1.8GHz i7, 4Gig Ram, 256Gig SSD, HD3000; Powerbook 12" G4 1.33GHz running Debian as a server; Apple TV (1080p version)
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DarkestRitual

 
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If it's the white unibody, it's the white 2.26 would be my guess, and he just missed a 2.
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Nethfel

 
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Quote:
Originally Posted by DarkestRitual View Post
If it's the white unibody, it's the white 2.26 would be my guess, and he just missed a 2.
You're prolly right *but* I try to not assume too much

My Macs: Late 2013 rMBP w/ 750m; Mac mini G4, 1.25 GHz, 512m ram (server); Late 2011 11" MBA, 1.8GHz i7, 4Gig Ram, 256Gig SSD, HD3000; Powerbook 12" G4 1.33GHz running Debian as a server; Apple TV (1080p version)
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OnceYouGoMac

 
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Quote:
Originally Posted by Nethfel View Post
The Penryn CPU can go as high as 105c TCase (thermal reading at the case), but it shouldn't stay there really for any length of time. Your sitting at about 101c, which to me is a bit high for a system with proper cooling - but I'm used to the aluminum model which will stay at 90-91c at 100% usage with the fan going. What seems a bit weird to me is that your fan isn't staying on all the time with 100% usage on both cores - I know mine did.

In terms of which is more accurate - I can't answer that - I know that many times programs that supposedly read the temperatures from the same registers can report different values (sometimes it may just be because of the timing of the reads of the data itself can be different causing a difference in values) but if the two display within a couple of degrees of each other, I wouldn't worry about getting all technical about which is more accurate. If there is a huge difference then I'd be concerned.

IMHO - First do a comparison to see how far off the two temps are. If they are far off, I'd probably rather the one that is reporting high to use for figuring what to set SMC Fan Control to kick the fans on at. If Temp Monitor is showing the cpu at 100c and SMC Fan is showing at 91c then I'd probably use Temp Monitor as my guide at least for how I configured SMC.

Also: Onceyougomac: could you possibly correct your system info: Macbook Unibody 2.6 Dual, 2GB RAM, 250 GB HDD - I've checked all of the Macbook models, and none of them (outside of the pro line) offer a dual core 2.6GHz CPU - it makes it hard to figure exactly which system you have for questions like this to find the proper CPU version as different mobile CPUs can have VERY different max temp values (ie: <90c to >100c and which you have is important when determining what the max safe temp is).

Oops sorry! Fixed.

It is not normal for a computer to constantly crash, freeze, and become infected by thousands of malicious programs. Microsoft has just convinced you that this is all normal.
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OnceYouGoMac

 
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So, no one knows exactly which temp monitor each program goes to, or which is considered more accurate? I cannot find this info anywhere.

It is not normal for a computer to constantly crash, freeze, and become infected by thousands of malicious programs. Microsoft has just convinced you that this is all normal.
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Nethfel

 
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Does it matter? Choose whichever one is reporting highest and use its temp offset (if SMC is reporting lower then the other reader) to determine what to set SMC to turn the fans on at and you'll be safe. You haven't even mentioned whether the two are really reporting different numbers...

My Macs: Late 2013 rMBP w/ 750m; Mac mini G4, 1.25 GHz, 512m ram (server); Late 2011 11" MBA, 1.8GHz i7, 4Gig Ram, 256Gig SSD, HD3000; Powerbook 12" G4 1.33GHz running Debian as a server; Apple TV (1080p version)
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vansmith

 
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I know this isn't what you're looking for but you still haven't addressed my earlier question which I think could be helpful. If we know what it is you're trying to do, we may be able to provide some alternatives/solutions which would relieve you from having to even consider this an issue.

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TattooedMac

 
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Well my SMC has the same reading - + 1degree as the iStat shows. I use the SMC to monitor temp since i dl it and really dont need to look @ iStat anymore.
I know its not the comparison you are looking for but what im trying to get out is IMO i think SMC is pretty well accurate

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chas_m

 
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All temperature monitors pull their info from the same place -- the temperature sensors of the Mac itself -- so they should all be within a degree of each other (and only that due to rounding generalisations).

And I agree with vansmith -- this is a CONSUMER computer you are taxing, and regardless of using fan control software to try and keep it a bit cooler, you are KILLING THAT THING by maxing it out so constantly.

Ever been in a server room? Those machines are built using parts of MUCH higher life rating than anything used in consumer computers, and they have to be kept at refrigerator-like levels of temperature in order to work reliably.

If *any* consumer computer could take that kind of abuse, it's likely to be Apple, but you know it just *wasn't designed* to be misused in that fashion. I think you can reliably count on having to replace that machine sooner than most of us.
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DarkestRitual

 
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And somebody named after an airport extreme base station code that they found within range of their local wireless is definitely a troll.
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