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Apple Notebooks Apple's notebook computers including MacBook Pro, MacBook, MacBook Air, PowerBook, and iBook.

MacBook overheat after RAM upgrade


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Dominick

 
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Hi all. Today I upgraded the stock 2GB of RAM in my unibody 2009 MacBook to 8GB of Corsair RAM. (yes, I know only 4GB is officially supported by Apple, but the OS reports 7.75 in use). The RAM had excellent reviews on Amazon from many people saying that it worked excellent in MacBooks and MacBook Pro's, so the RAM should be compatible. Everything works excellent, and the performance is definitely faster, however, my Macbook is now reaching temperatures of 145-160 degrees Fahrenheit almost idle, and in conditions my old setup had the temp of around 106-115. I now have to keep my fan running at about 4000 RPMs just to maintain a CPU temp of 150. Also, my battery life is being killed; I am down about 10% just writing this message.

My question is this: is it more likely that my RAM is faulty (which users have reported in rare cases on Amazon), or that Apple does not support this amount of RAM because of these problems.
Or, have I done something wrong on installation?

Thanks

Also, should I continue to use my MacBook during this period? My Mac reaches temps of around 200 easily when converting videos so I shouldn't think that the heat would kill it.

Dominick
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Lifeisabeach

 
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Quote:
Originally Posted by Dominick View Post
Hi all. Today I upgraded the stock 2GB of RAM in my unibody 2009 MacBook to 8GB of Corsair RAM. (yes, I know only 4GB is officially supported by Apple, but the OS reports 7.75 in use). The RAM had excellent reviews on Amazon from many people saying that it worked excellent in MacBooks and MacBook Pro's, so the RAM should be compatible. Everything works excellent, and the performance is definitely faster, however, my Macbook is now reaching temperatures of 145-160 degrees Fahrenheit almost idle, and in conditions my old setup had the temp of around 106-115. I now have to keep my fan running at about 4000 RPMs just to maintain a CPU temp of 150. Also, my battery life is being killed; I am down about 10% just writing this message.

My question is this: is it more likely that my RAM is faulty (which users have reported in rare cases on Amazon), or that Apple does not support this amount of RAM because of these problems.
Or, have I done something wrong on installation?

Thanks

Also, should I continue to use my MacBook during this period? My Mac reaches temps of around 200 easily when converting videos so I shouldn't think that the heat would kill it.
According to EveryMac.com:

Quote:
*Apple officially supports a maximum of 4 GB of RAM. Originally, this model was only unofficially capable of stably supporting 6 GB of RAM, but as confirmed by site sponsor OWC, it is capable of supporting 8 GB of RAM if updated to Boot ROM Version MB51.007D.B03 and running MacOS X 10.6 "Snow Leopard."
So first off… did you update the Boot ROM and are you running Snow Leopard?
Secondly… which EXACT modules of RAM did you get? Post a link please.
Thirdly… have you tried putting the old RAM back in to see if the problems abate? If not, do so to be sure this isn't simply a coincidence and something else has gone wrong.
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PatM

 
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I don't think the ram has anything to do with it. Open activity monitor and see what is running amok. You should be able to track down what program is causing the high cpu usage.

I'm new to Macs myself but based on things I have read on this forum about these types of things it makes sense to me to try that first and see if you can see something.

If you can identify the program you can then troubleshoot from there.

I hope this helps a bit.

Regards,

Pat

15 " 2013 MBP OS X Ver. 10.9.1 16 GB Memory, 500 GB SSD, Retina, 2.3 Ghz I7, 30GB IPhone 5, 2012 Mini Cooper JCW Coupe, 2014 Toyota Corolla, 2007 Trailblazer, 2 RC Planes, 1 fantastic wife who puts up with my toys. Still Married After 30 Years.
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Dominick

 
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@PatM, you are correct; after posting on another forum and troubleshooting with users, I thought to check activity monitor and look at CPU. Spotlight was indexing my entire computer, which was taking around 40% of my CPU at times. Currently my CPU is idle, however, and it is still around 145.

@lifeisabeach, 1. I have tried replacing and it works as before.
2. I just realized I bought 1333 MHz... (SON of a...)
3. Does anyone know if this is a big deal? several people gave positive reviews on Amazon and as far as I know, most macs use the 1066 MHz
4. Amazon.com: Corsair 8 GB DDR3 Laptop Memory Kit CMSO8GX3M2A1333C9: Electronics

Dominick
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If you bought DDR3 1333 modules and they fit, then you have the late 2009 model MacBook. However, the specs for your machine say that it uses DDR3 1066 modules. The faster modules may or may not work correctly. Some users that have used faster modules in their machines have reported problems.

I would return the modules to Amazon and have them send you the correct ones for your machine. According to Mactracker your machine can take up to 8 GB of memory although Apple recommends 4 GB.
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Dominick

 
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I think I shall return them; it may cost $10 or so, but I'd rather have the right one, especially if it solves this heating problem.

And, as I said above, I'm aware that Apple says 4 is the max, however, I know many who use 8 with no problems.

Thanks for all the help-will update if the new modules give the same problem.

Dominick
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Lifeisabeach

 
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The RAM almost certainly is the problem. In the PC world, there are some motherboards that can accept 1066 and 1333 RAM modules, and with the 1333 modules, the CPU essentially overclocks to match the RAM speed. I haven't tinkered with a motherboard in a Mac, and Apple certainly doesn't support overclocking themselves, but that would explain everything you are experiencing. Apparently you can tune the RAM to slow down, but it's risky and not simple. Here's a discussion I found about this exact same thing you have going on:
MacBook6,1 + 8GB Corsair ram = hot - MacRumors Forums

Quite frankly I would just return the modules and get the correct ones.
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Dominick

 
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This definitely explains it. I guess I didnt search well enough-sorry for the repost.

I assumed something like over clocking was happening, but I had also read that Mac tones down that automatically.

I will definitely be returning the chips. Thanks for everybody's help.

Dominick
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