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I have late 2015 i7 4GHz and in normal usage in a cool room cpu temperature is around 40c to 50c!
If I use lightroom classic cpu temperature goes to 99c,100c .. and then it may get lower to 80c and so on ..
Do I need to replace cpu thermal paste after 6 years normal usage? My iMac is open since I have replaced blade ssd and sata ssd.
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While Apple doesn’t use the best TIM, its life span is around four years.
While the effectiveness of the heat transfer is important, we tend to get too stuck up on this little detail forgetting the bigger one DUST & DEBRIS! Both clog up the fan blades and the transfer fins so the heat sink is not effective in shedding the heat it has amassed. Let’s use a model to see why cleaning the dust and debris is the more important action.
I have three buckets and the first two have a hole in them and are stacked on top of the one that doesn’t. So now we pour water into the top bucket and the amount of water I pour is likewise exiting to the next bucket as well as the next.
Now lets clog the top buckets hole over time the bucket will overflow over the lip of the bucket making a mess! This would be the effect of the TIM failing. Now what happens if the second bucket is clogged this would be the effect of the fan and heatsink failing.
Now lets change the buckets to closed tanks with solid piping which is closer to what we have as the failure of the second container will allow the water (heat) to backup to the upper container! This is why people think the TIM has failed when in truth its the junk collecting internally blocking the effectiveness of the cooling system.
So unless you are a serious music, photo or video producer pressing your system hard or a heavy gamer I wouldn’t worry about the TIM yet maybe next year. I would focus on cleaning the dust and debris!
To help you see things install a good thermal monitoring app like TG Pro I find this app to be one of the best!
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Which Thermal paste(kit) would you recommend for iMac Late 2015 i7 4GHz 6700K ?
I personally use Kryonaut on my Mac Pro system as I run it very hard doing image processing. For someone who is hard on their gear I would recommend it. Remember its not the quantity that matters! To many people over do it!
Think of a thin piece of tissue cut to the same size of the CPU's heat spreader, now wet it slightly and bunch it up into a ball how big is this tight ball, thats the size of TIM you need! Not more nor less!
I'll also worn you getting the CPU and heatsink back on is a bear! So unless you are sure this is truly needed I wouldn't do it.
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6 years is the normal frequency when you should be replacing thermal paste, but that number goes down when you’re running applications that demand a lot of CPU usage on a daily. I’d say that a reasonable frequency would maybe be every 2 years or so.
You can also follow this guide for instructions on how to apply thermal paste. Comment appliquer de la pâte thermique
Also, as a precaution I’d make sure that your cooling fans are clean and are properly spinning.
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Which Thermal paste(kit) would you recommend for iMac Late 2015 i7 4GHz 6700K ?
Arctic Silver is the one I use when replacing. Just be sure not to use too much, and use alcohol based wipes when cleaning off the old paste.
@jmehnert - Agreed! [produit lié absent ou désactivé : IF179-010-2] for most systems I use it too!
Most people don't need anything better, heavy pro's and advanced amateurs need every bit of headroom they can get as the Intel CPU's just run so %^$$ hot!
While the current M series SOC's Apple is now going with are so much better they too will creep up needing better thermal solutions but thats still quite a few years away unlike what AMD and Intel are pushing on the high end with 250 watts of heat!
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Hi!
I would say it depends on the quality of the thermal paste, but change the paste each year seems to me the best solution and so each year you can evaluate by yourself about the quality of the thermal paste you used…
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@barbegame - Unless you are a heavy gamer or Pro doing heavy processing jobs you don't need to go to this extreme. Even they don't either, they focus on the fans and heatsink fins making sure the heat the heatsink is collecting is able to be off loaded. Review the mind model I posted above to see why this is the real issue not the TIM for 80% if not more of the overheating issues.
As far as the differences in the TIM quality unless you are pushing your system extremely hard there really isn't any difference. People overdo things as they have been programed into thinking it as an issue when in fact its the cleanliness of the system which has a bigger factor - Dust and other debris buildup!
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I generally change my paste immediately when i get a new device and then once every 1-2 years just to keep things fresh.
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@urbanfreestyle - You're over doing it. What was an issue back in the 80's is not an issue anymore! Give it six years then worry! The bigger issue is the dust and other stuff messing with your systems active cooling ability to shed the heat.
Agreed i over do things however if i am building or owning a system, i want to know what paste it is, how it was applied and it's just part of my cleaning routine :-)
@urbanfreestyle - Still think you're pushing it ;-}
Think of it this way you use a carbon sheet in your old typewriter to make a copy of what you write do you use the same care with the carbon sheet? As long as the copy is readable its fine!
So let's think this from a TIM perspective the same interface between the two sheets of paper the transfer of the heat without failure is the issue. TIM's don't breakdown that much once they are in place as they are filling in the microscopic imperfections of the metal surfaces nothing more! The thinner the better! Just like that carbon sheet as long as the heat is moved its fine! The bigger issue is the heat and dumping it.
I'm fully aware of the mechanics of it, system builder for over 20 years and IT Professional for 15. Like i say i know it's overkill but doesnt do any harm.
@urbanfreestyle - Whats easy for us is not easy for many!
The iMac's are not easy to get the CPU out and back in afterwards. Doing a Windows desktop is a cakewalk in comparison!
just replaced the thermal paste of my 2014 macbook pro and seems to be working ok. Thermal Grizzly found on amazon.
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