hot hot hot hot

Hi folks.

I've a MacBook Pro(15" Core 2 Duo Model A1211). I'm very fond of it except it's heating issues.

Last year I gave it to it's official service in my country to clean it's inside up from dust. They did so and it's temperature decreased some. At winter I'd no problem since the weather was cool but with summer on the door my Mac started to get hot again.

Well, it's not as hot as before service time but it started getting hot again. Especially when emptying the trash or encoding a video. I know that it should get hot at those kind of times but would changing it's thermal paste do any vast change since I read a lot of articles on the web that Apple doesn't know how to apply thermal paste and how cool their Mac got when they changed their's thermal paste.

Update

Thanks for your answers guys. Really shaped my way.

I've been using smcFanControl for quite some time. I set my fans to start running on 3500 rpm.

Some time ago I reinstalled my OS X. Well, it wasn't the reinstallation of Snow Leopard which I use at the moment but it was Tiger back then. I installed Snow Leopard not as a fresh install but as default(archive & install) from the installation disc.

I'm considering CoolBook but I've some questions about it. Would I have to change the clock speed of my CPU? If not only changing my fans revolutions per minute with CoolBook make any difference than smcFanControl.

Also I've 4 GB's of 667 MHz DDR2 SDRAM on my Mac. That's why I don't think that the RAM amount is a problem. And my HDD is 320 GB with 7200 rpm. But if you still think that that amount of RAM is not enough or my disk needs re-fragmentation I'd love to read your thoughts.

All in all, I'm definitely considering opening my Mac and re-applying the thermal paste. So could you please advice me the best one.

Answer this question I have this problem too

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CoolBook has nothing to do with fan rpm control. You can use CoolBook to alter the minimum voltage of you CPU for any given clock speed. For example, my MacBook's CPU voltage setting when running on 2.1Ghz was 1.1375V. Using CoolBook, I managed to lower the setting to just 0.9750V, which is around 20% less voltage in the core, which also means 20% less heat and consumption as well. Since I installed and configured CoolBook, I have NEVER heard the fan running to its max setting.

Configuring CoolBook is somehow troublesome (you'll have to test your CPU's limits in lower voltages by trial and error meaning a bunch of restarts, but once you've read and understood the readmes, you'll be up and running with a cooler MacBook in less than an hour.

As a final note, CoolBook UNDERVOLTS the CPU, it does NOT overclock it. The CPU can NOT be damaged by undervolting it, you'll just end up with a couple of kernel panics in the process. In other words, read the manual well.

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hmm... i guess, your Mac is out of warranty. if so, there is absolutely nothing, what can stop you from reapplying the thermal compound. yes, apple computers, especially their MB looks like someone have used spoon, when applying... too much and at wrong places. if you get thermal compound, try to get silver one. it is the best.

maybe your heat-sink is clogged again. try to clean it. maybe the fans are not working. did you try any sort of monitoring application, to check on fan RPM's?

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Having a look at CoolBook would definitely help you. I have it installed on three MacBooks and a 15-inch MacBook Pro and -after some fiddling with the settings- they run far cooler and for more time on each charge!

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CoolBook is NOT a cooling pad; it is an application that allows you to undervolt your laptop's CPU to it's limits, which leads to lower power consumption on the CPU, hense lower temperatures to start with. I agree you should also try smcFanControl, just to check if your fans are working properly. Putting the fans to max rpm in not a solution, IMHO. You don't deal with the problem itself; just with the symptom.

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I clean my fans twice a year on my laptops, sometimes once every two years, and I almost never find a significant amount of dust, so unless you live in a dusty area, I doubt its because of dust collection.

Make sure you rest your mac on a hard surface and not something soft like your bed, couch, lap, etc. This is to ensure that airflow is optimal and also the the heat is not retained.

If something as simple as emptying the trash is significant enough to heat up your laptop, that may be due to either a low amount of RAM or a fragmented HDD (AKA it takes long enough to heat up, thus something is making it slow). So either upgrade your RAM (the max for your model is 6 GB) and/or conceder buying a defragging program for your mac or backing it up to time machine and reinstalling OS X and importing all your files back into it. If you have never reinstalled Mac OS X, fragmentation may be the biggest factor in this.

Another two options are to get Fan Control to ramp up your fans as the computer gets hotter (as suggested by palokiller) or get a cooling pad, as theanar suggested

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I use and recommend smcFanControl. People on the Fan Control page were complaining about it and recommending this. I have my fan on my MacBook set to run at full speed while it's plugged in. That way, it keeps cooler, which should make everything last longer.

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I am using my macbookpro 1211 for live vjing with resolume. while that worked fine for quite a time, last weekend the CPU went into core shutdown in the middle of a set. Clubs can be hot. Embarrassing. I disassembled the machine to see if the cooling is clogged or something, but everything seemed nice and clean. Today I read about some cooling problems and stumbled over coolbook. I reduced the CPU Voltage from 1,2V at 2,171GHz to 1,025V. So far the System appears stable. Temperatur dropped from about 81-84°C down to 69-71°C. So far this seems to resolve my issues. I did not lower the voltage bellow that point so far, maybe I'll try later.

Anyone else here got some experiences in undervolting? Please post what you found.

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OK, on my machine 1,025V seems to be the lowest safe setting. At 1V it crashes at boottime. Safe boot was required to deactivate coolbook. Returned coolbooks settings to 1,025V after reboot, seems to be fine so far.

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Hello scherbenreich,

I've been using coolbook on 3 MacBooks and 2 Pros and so far I can say it's definitely a gem! The lowest setting on each CPU is different, that's why the default setting is high, in order to include even the worse of CPUs, regarding voltage. You should try running the test application found in coolbook's website on the setting you found stable for a couple of hours to see if it works ok too. If you get any errors, you should ramp up the voltage by one click. Generally speaking, you should keep the one setting higher than the one that passes the tests, just to make sure. You should also add settings for the other speeds of your CPU. I believe that sensitivity set to "high" would be perfect for you. You could also try limiting the temperature (the CPU speed will drop to keep it down) however I don't know whether it would be OK for your applications, you could experience video shuttering or something.

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Thanar,

In fact I somewhat missed that temperature setting. Reducing the speed might in fact reduce the framerate down to a rather dissatisfying level, nevertheless, a lower framerate is way better than a crash or unresponsiveness. I'll experiment on that and talk about the results here.

Yesterday the 1,025V setting proved to be unstable under sustained heavy loads. I Increased to 1,050V and after a 12h test run in my normal living room ambience the system remained stable and not hotter than 75°C. I'll see if this increased temperature headroom will be sufficient for the real world.

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You should really follow the instructions in the readme file that accompanies coolbook. There, you'll see that you have to find ideal pairs for all of your CPU's speeds, and set the sensitivity to such a setting that will ramp up or down the speed as needed for your applications. The procedure you should use to locate the ideal voltage for given processor speed is also outlined in the read me file.

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I highly recommend to you to open the case, reach the funs and clean them properly. Sometimes there is so much dust that it forms a small carpet that completely stops the airflow.

Changing the thermal paste doesn't have a noticable impact, at least for me. I just did it before a couple of days and to be honest I haven't noticed any difference. On the other hand removing the dust has a huge impact.

When I first opened my 2 Macbook Pro(s) before a year, they were both already 4 years old. The fans were getting noisy within 1-2 minutes of switching on: because of the dust. When I opened them, I was shocked by the amount of dust that there was in there. No wonder, they were so hot. At the time, I cleaned properly the dust and even put oil at the axis of each fan. Since then, it has been extremely quite and cool, better than new.

Now, after a year, I decided to clean it again plus I put new thermal paste (I put Silver Arctic 5 last weekend). The paste doesn't make a difference, probably it doesn't worth the hassle. Try just cleaning the fans. Undusting should be enough 99.99% of the times. You will see a huge temperature drop.

I have used ifixit guide.

Good luck

Andreas

ps: Watching Video CPU temperature: 60 Celcius

Idle CPU temperature: 50 Celcius

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Can Surmeli will be eternally grateful.
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