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I found Macs which had:


Is it possible to put 16GB running at 1600MHz in my Mac?

If you've done this, please post a screen shot.

Apparently you need a Macbook Pro with an i7 processor of at least 2.2GHz or more in order to use memory running at 1600MHz.

My hardware

  • Macbook Pro 8,2 early 2011 - 2.0GHz i7 quad

edit: I recently found this sleepimage. Basically it's just a swap file of your RAM. so your mac can 'sleep'. But when you install 16GB you're gonna have a 16GB RAM file sitting on your disk as well. Which you can safely delete but it will be recreated when your mac goes to sleep. just something to consider when your working with limited disk space.

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I don't know why you accepted the answer provided. It's wrong. Users here: forums.macrumors.com/showthread.php?t=1133642 have upgraded their MBPs to 1600MHZ RAM without problems. Moreover, system profiler reports that it's rubbing at full speed. –  cksum Feb 1 '13 at 16:09
Because it is not posible with the processor I have –  FLY Feb 4 '13 at 8:11

8 Answers 8

up vote 4 down vote accepted

It's not possible to use RAM running at 1600MHz in your Macbook Pro 8.2, because it's not supported by the processor.

Your Macbook Pro has the Intel® Core™ i7-2635QM Processor which only allows DDR3-RAM running at 1066/1333MHz according to Intel. (see link for official specs)

While the 2635QM processor does not support 1600MHz memory, it does support 16GB RAM:

official specs from intel

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What about the screen-shot added to the question - I found it myself: it's the i7-2720QM, which supports: Memory Types: DDR3-1066/1333/1600 –  iolsmit Feb 29 '12 at 18:06
@iolsmit The screenshot if for the 2635QM. –  gentmatt Feb 29 '12 at 18:10

I successfully bought and installed a 16GB Patriot kit (2x8GB) of PC3-1600 (12800) in my 15" MBP 8,2 (2.3Ghz Early 2011). Used to have 2x4GB PC3-1333, now it runs 2x8GB at 1600 speeds! No extra software needed, and even Boot Camp (Win 7) had no issues... so far. 48 hours since I installed it, and I feel good. While I know YMMV, just make sure you have HIGHER than 2.0 Ghz (2.2 and up) CPU and 2011 or newer, and you should be ok. No idea about the 13" models, though.

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16 GB should be possible - but I'm quite sure it will always run at 1333 MHz, as the firmware sets the clock speed. Thus, even if you buy a 1600 MHz module it should run at 1333 MHz (edit: 1600 MHz is possible, see comments)

And I could not find any 8 GB module at 1600 MHz.

So I would recommend to get 16 GB at (at least) 1333 MHz.

about this mac


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I did find some screenshots with people having 8GB of mem running @ 1600mhz. I'll post the screen in my question. –  FLY Feb 29 '12 at 16:59
the KHX1600C9S3P1K2/8G mem modules will run on 1600mhz but be aware the 8GX version will still run on 1333mhz according to the dutch article in my question –  FLY Feb 29 '12 at 17:09
Good to know that Apple allows faster clock-speeds if the hardware supports it. But the KHX1600C9S3P1K2/8G is still a kit of two 4 GB modules - did you find a single 8 GB module at 1600 MHz ? –  iolsmit Feb 29 '12 at 17:49
How can we be sure that the 1600MHz are being used to the full potential? Trying to get an answer here: Using memory with a higher MHz rating? –  Baumr Dec 12 '12 at 17:48

A bit late, but I'm running the Early 2011 MBP with the 2.0Ghz intel core i7 2635qm (or 2630qm not sure) which by intel does not support 1600Mhz memory. Believe it or not; I've got 16gb ram buzzing at 1600mhz. My about this mac reports I can have two bars of 1600mhz and extended system information reports that my RAM is running at 1600mhz.

And by the way, 1333mhz and 1600mhz doesn't differ a lot in price now so why not take the chance. I can assure you it will work at 1600Mhz anyways.

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At the time of asking this question there was bit of price difference. –  FLY Feb 5 '13 at 13:20

Check your computer make and model on Crucial. It'll give you all the valuable intel you'll need to make the right decision.

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I can get both versions of the KHX Ram to operate at 1600mhz. I bought the software to do it. If you need assistance, reach out. bclarke@n-tieractive.com

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Some of the information contained in this post requires additional references. Please edit to add citations to reliable sources that support the assertions made here. Unsourced material may be disputed or deleted.

If you could explain a bit about how software is needed to run RAM, that would make this a better answer. –  bmike Mar 20 '12 at 18:35
but you still need the cpu that supports the 1600mhz I suppose... –  FLY Mar 21 '12 at 7:57

I just installed 16gigs 1600mhz ram in a 2011 17 inch MacBook pro i7 2.2 and it's working great and is running at 1600mhz in the system report.

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I'm running 1600Mz on 2011 17 MacPro that originally came with 1333Mz

enter image description here

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