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on January 8, 2014
I'm pleased to report that indeed, 16 GB of RAM does work correctly in the 2011 MacBook Pro, and, it is even recognized at it's full speed: 1600 MHz. All the functions of the MacBook Pro work correctly, including waking from sleep. Having this much RAM may seem like too much, but it is great if one uses several programs at a time or works with large datasets or image files.

Installing this RAM is relatively easy. There are instructions in the MacBook Pro's User Manual and online at Apple Support; even nicer instructions with step-by-step pictures can be found at sites like ifixit. Basically all one has to do is remove the screws on the bottom of the case, being careful to keep track of location of three of the screws that are longer than the rest.

As for quality of the Crucial RAM, the actual memory chips are by Micron, a respected manufacturer that supplies Crucial with most of the RAM they sell. After installing the RAM, I used the Apple Hardware Test (AHT) to verify that this RAM worked as it should in my MacBook Pro. I followed up on the AHT by running Memtest overnight to test the RAM - it passed with flying colors!

You may wonder how come it's ok to use 16 GB of RAM when Apple specified a maximum of 8 GB of DDR3 1333 MHz RAM for the 2011 series of MacBook Pro laptops? As you can see if you peruse the web, there are many, many reports of users installing and successfully using a maximum of 16 GB of RAM in the 2011 MacBook Pro laptops. The reason why Apple specified only 8GB as a maximum is that when these MacBook Pros were released, RAM modules denser than 4GB were not available in the appropriate sized SO-DIMM. With the subsequent improvement in RAM manufacturing technology, it's now possible to use up to 16 GB of RAM in the 2011 MacBook Pros. It's simply the case that Apple has not upgraded the specifications of the 2011 MacBook Pro.

In sum, if you are considering increasing the RAM in your MacBook Pro, and it's a 2011 model, it's safe to use this DDR3 1600 MHz RAM instead of the 1333 MHz RAM. You may ask why would one want to use 1600MHz vs. 1333 MHz. I choose to do so because, surprisingly, the 1600 MHz version was actually cheaper than the slower 1333 MHz type. It may not always be the case because RAM prices are very volatile, but it bears checking into if you are shopping for new RAM.
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on July 23, 2013
If you go to the crucial website and have them scan your MacBook, they'll recommend you a CT kit with a serial number that doesn't match this one. As alarming as that might seem, the crucial website FAQ's indicate that the serial numbers may vary for warehouse storage and distribution, and that you should pay attention to the listed specs instead.

Anyways, the installation was surprisingly easy. It consists of a simple unscrewing and removal of the back panel followed by popping the old ram sticks out and popping the new sticks in that even an tech-unsavvy person like me could perform. I found the RAM replacement video guide on crucial's site helpful, since the guy points out a few safety considerations like static discharge and the numbers and placements of screws.

Once installed, I immediately noticed the difference in the upgrade. Applications are opening much more rapidly than they used to, and Parallels for Mac is running in seamless clarity. I highly recommend this upgrade to other MacBook Pro users running on 4 GB of RAM or less.
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on April 30, 2013
I initially installed this memory in the already-open slots 1 and 3 (the factory RAM was in slots 2 and 4) and got 3 beeping sounds and no bootup. After following the advice of another reviewer here, I turned it back off, opened the memory compartment back up, and swapped the positions of the factory RAM and the Crucial RAM so it went like this:

Slot 1: 4GB Apple RAM (Top slot if iMac is upright)
Slot 2: 8GB Crucial RAM
Slot 3: 4GB Apple RAM
Slot 4: 8GB Crucial RAM (Bottom slot if iMac is upright)

That worked fine and I now have 24GB of RAM installed on the Late 2012 27" iMac.

Tip 1: the Crucial RAM is a tight fit in the memory slots. To get them back out to swap their positions, I first had to remove the Apple RAM so that I could get a better grip on the Crucial RAM.

Tip 2: I had difficulty getting the memory access panel off of the iMac because my finger wasn't going far enough in to depress the button all the way. I used a small key (a screwdriver would work too) to push the button in all the way to get the access panel to pop open.
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on January 28, 2015
Don't believe the "official" Apple specs or the nay-sayers who tell you that your early 2011 MacBook Pro can't handle 16GB of memory, or that it can't handle 1600 Mhz memory. This memory has been installed in my system for weeks now and is working perfectly.
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on March 9, 2018
Like others, i assumed i could only install 8 Gigs max of ram on my laptop. MacBook Pro (13-inch, Mid 2012) 2.5 GHz Intel Core i5. I didn't think i could have more than 4 gigs initially. Anyways. I did A LOT of research and found that crucial offered 16gig and said it worked on my laptop. Guess what. It did. Before this i had both slots filled with 2 Gigs of ram. Totally 4 gigs. After the OS High Sierra Update, things slowed down dramatically. Even prior to this, i had a hard time running the newest photoshop cc, or illustrator together. Start up, mail.. everything was crazy slow.

After installing this i crossed my fingers and BOOM! Super fast. Its like having a brand new computer and I can actually do some pretty intense graphic work on my macbook.

Its only been a few days, but everything seems to be working great. Laptop isnt hot or anything. If things continue like this, i'll be a lifelong Crucial buyer! One of the best purchases i've ever made on Amazon!

(See attached Screen Shot of Ram Installed)
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on October 31, 2014
Just wanted to add my two cents that this works with the new iMac 5K (aka Retina 5K, 27-inch, Late 2014, iMac15,1). 32GB at 1/3 Apple's price. Performance is perfect.
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on October 9, 2013
I was hesitant to buy these from amazon because the product model Number didn't match what crucials website said I needed when I chose my system on their product finder system. Later I was told by crucial that they use the same exact modules but give different product numbers to them depending on what system you input into their product finder. So long story short, I bought them and installed them I. My brand new imac.

My system booted on the first try and all 32gb worth registered in the system without any problems. This is an excellent deal! Apple wanted to charge $600 to go from 8gb to 32gb. I spent less than $300 to do the same with these modules and I got to keep the original 8gb of ram that came with my imac to use I. A different system!

One more thing!
Installing these isn't for the faint of heart! You hand to align them in the slots just right and push them I. Pretty hard to fully seat them. They may seem like they don't want to fit or are too big, but trust me, they fit and work just fine. Just push on then hard and they will go in.
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on April 28, 2016
I installed this RAM in my QNAP TS-451+ NAS (which officially only supports up to 8GB of RAM, however I can tell you the NAS recognizes and utilizes all 16GB of this RAM without issue) and I immediately noticed a speed boost. Quicker bootup, no more slowdowns while multitasking, and even when not multitasking it seemed all-around snappier, so this RAM is a winner in my book. If you have a TS-451+, buy this RAM with confidence. Just be ready to disassemble practically the entire NAS to get to the slots to install it (not very difficult as long as you're careful and static free). For those of you looking for other uses, I can still recommend this RAM, I just don't know how much better it will be than what you already have (It's probably better, especially if you have less than 16GB to start with). As a plus, I've also only ever had pleasant experience with Crucial CS, and even better than that, I've only ever had to contact them once in over 12 years of using their RAM.
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on April 25, 2016
I purchased this for my EARLY 2011 Macbook Pro (13") a few days ago... information on Apple website kind of told me that for my Macbook Pro, max I could have was 8 GB RAM. I used scanner from Crucial website that indicated that I could go up to 16. For the price of the RAM on sale, I decided to give it a go. I just finished installing 2 sticks of 8 GB RAM each. I run full standard Windows (because of Pentium processor) and I run Apple's OS as well. I restarted computer and checked on from both operating systems and both show 16 GB RAM!...
It works!
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on June 2, 2015
I wanted to post with a low enough rating that the review would be read by perspective buyers. I have no issue with the Amazon vendor.

For those of you buying these chips for an iMac Retina 5K....dont do it. These chips cause the sleep/wake function to fail. Upon removal of the chips the functionality returns.

This is a known issue and has been reported at the crucial website since December 2014. Crucial has decided to act like it news to them each time it is reported.

I purchased replacements from Other World Computing (OWC) and these chips work flawlessly including wake/sleep.

If you never sleep your iMac these chips seem to otherwise function properly. But not sure if other issues will crop up later.
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