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Capacity: 16GB KIT (8GBx2)|Change
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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 December 18, 2012
I bought this kit to upgrade a late 2012 Mac Mini. Worked flawlessly, as I would expect a Crucial product to do. Amazon had this for less than buying direct from Crucial, free shipping, and fast delivery. What's not to like?
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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 June 10, 2013
I spent a lot of time to make sure Macbook 2011 13" (i5 2.3G) will run 1600MHZ. Mixed views all around. Worried this would not work, I actually ordered a set of 16GB 1333MHz from Crucial at over $110 on Amazon, turned out to be not good and had to do a refund. You can guess how surprised I was to spend less than $90 here and have a much better product.

My Macbook Pro 13" 2011 early, which "offcially" states only support 1333MHz, instantly picked up 1600MHz 16 GB without any problem.

My old setting was 8GB 1333MHz. I used to run Photoshop and other Adobe products, Windows 8 on Parallel Desktop and few browsers and many others softwares for web design purpose all at the same time. It would stuck here and there, esp. Photoshop, actually always stuck - made it the reason I want to improve my memory.

It proved to be a wise decision. Now, with all major programmes running, I have no problem. Now I can have a smooth Photoshop and Windows at the same time.
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on January 16, 2013
I have always had great experiences with crucial memory and this was no exception! I purchased a set of these to bump up the RAM in my new 27" iMac from 8GB to 24GB and it worked like a charm! My computer is running faster than ever now, and I doubt I will ever have to add any additional RAM to it. However, if I ever do, I will gladly buy another set of these to max out my RAM to 32GB.

Additionally, this product is SO much cheaper than buying from Apple. To bump my RAM from 8GB to 16GB would have cost $200 if I had purchased from Apple! With this product, I am now sitting at 24GB at less than 1/2 the cost of an additional 8GB of RAM from Apple. I could not recommend this product highly enough!
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I purchased the Crucial CT2K8G3S160BM 2x8GB to increase the memory in my Lenovo Y410P laptop from 8-GB to 16-GB. My Y410P has two memory slots, and one slot was already occupied by a factory-installed Samsung M471B1G73QH0-YK0 8-GB memory card. I probably could have just added another 8-GB card. But to avoid any possible memory glitches, I prefer not to mix-and-match memory cards of different types. The existing Samsung memory was PC3L/DDR3L, with the 'L' signifying that it is low-voltage 1.35V memory, whereas the standard PC3/DDR3 memory uses a higher voltage of 1.50V. You should not combine memory of different voltages or use memory with incorrect voltage since your laptop may not even boot up. To further maximize compatibility with my laptop, since it came equipped with CL11 1600-MHz memory, I likewise wanted to stick with CL11 CAS Latency speed, instead of going for memory with a faster (lower) CL rating. Some CL9 memory cards have faster specifications, but I really think that most people will not notice 2-nanoseconds of extra latency. So I ordered this CL11 1600-MHz memory because I wanted to exactly match the specifications of my laptop's original 8-GB memory card to ensure compatibility since using mismatched memory can cause system instability. And this memory has been working flawlessly in my laptop!

In real-world applications benchmarks, there is barely any difference between using CL11 memory and using some fancier CL9 memory, and the unnoticeable speed difference is not worth paying extra money for more-expensive models of CL9 or faster memory. With most applications, if you compare CL7, CL9, and CL11 application benchmarks, the differences mostly amount to 2% to 4% differences in benchmark timings. Along with the CL listing, another important memory performance indicator is bandwidth, and this Crucial memory's DDR3 1600MHz has a very good maximum bandwidth of 12800MB/s. But what does this mean in real-world performance terms? Relatively little. As long as you have enough memory to hold the applications that you are running without paging, RAM speed is only very rarely a performance bottleneck. Even with quad-core CPUs, the bottleneck is more likely still going to be the CPU . The reason for this is that the CPU's branch prediction algorithms are so accurate that, in the vast majority of circumstances, the data is already in the cache when the CPU needs it. So direct calls to RAM are quite rare. The branch predictor is like the CPU's personal assistant; it guesses what piece of information the boss needs next and makes sure it is already on his desk by the time he needs it. Occasionally, the assistant will get it wrong and the boss will have to forage around and find the information himself. In CPU terms, "foraging around" means retrieving the information from RAM, or (worst case scenario) disk, while if it is "on the boss' desk", that is equivalent to it being in the CPU's cache. And if your computer is equipped with an SSD using Intel's "Smart Response Technology" or if your computer uses SSDs instead of hard disks, it may retrieve the data from the speedy SSD instead of reading from a slower hard disk.

So the days are long-gone when purchasing high-end expensive RAM actually makes a tangible difference to your computer's performance. As long as it meets the basic specifications that your chipset requires, there is not much to be gained by paying more. Some performance gains are possible from buying better RAM, but these days, most tests tend to show that such performance gains are minimal... far, far lower than you will get from adding more RAM (not necessarily faster RAM, just *more* RAM) or a faster CPU. This was not always the case. When the Pentium IV first came out thirteen years ago, it used a new type of RAM that had, at the time, very high bandwidth, but also very high latency. AMD's Athlon used traditional RAM with lower bandwidth and lower latency. Some types of applications (e.g. video and audio conversion) were very sensitive to bandwidth, but less sensitive to latency. These types of applications showed significant performance gains with the Pentium IV. Other applications (typically games and office applications) were more sensitive to latency and favored the Athlon.

Overall, this Crucial memory is a great buy! Don't overspend on memory just because a brand or model of memory touts better specifications. If you are a hardcore computer gamer with a $4000 gaming laptop, you may opt for faster high-end memory to complement your top-of-the-line CPU and graphics. But most people should focus far more on how compatible that memory's specifications are for your system because the differences between CL ratings are negligible if you are considering CL rating differences of 2 or 3, while using memory that is not correctly matched or compatible with your computer can cause a variety of problems.

After I removed the original Samsung 8-GB memory from my Y410P laptop and added these two Crucial SODIMM cards, I reran the Windows Experience Index benchmark and got the same WEI "Memory operations per second" score of 8.1 that I had with the Samsung memory. The WEI "Processor: Calculations per second" also remained unchanged at 8.1. This was not surprising considering that both the original Samsung memory and this Crucial memory have the same specifications.

I also purchased a single 8GB card of this same Crucial memory to upgrade my HP Chromebox, which comes equipped with only 2GB in its single memory slot. There is a lot of misleading information on the Internet stating the maximum memory that you can use in the HP Chromebox is 4GB. But that is incorrect since the HP Chromebox can fully use 8GB of memory. After I upgraded my HP Chromebox, the Memory Monitor app on its Chrome OS displayed the memory capacity as 7.9GB. 2GB of memory is sufficient for a Chromebook/Chromebox if you are just browsing with a few tabs open. But if you want to open up lots of tabs and run lots of apps, or if you plan to install Linux or Windows on your Chromebook/Chromebox, then adding more memory will help with performance.

Note that Crucial has two identical 16-GB 2x8GB kits with identical specifications, with each memory product having two different part numbers: CT2K8G3S160BM/CT2C8G3S160BM Crucial 16GB Kit (8GBx2) DDR3 1600 MHz (PC3-12800) CL11 SODIMM 204-Pin 1.35V/1.5V Mac Memory CT2K8G3S160BM , and CT2KIT102464BF160B/CT2CP102464BF160B Crucial 16GB Kit (8GBx2) DDR3 1600 MT/s (PC3-12800) CL11 SODIMM 204-Pin 1.35V/1.5V Notebook Memory CT2KIT102464BF160B. CT2K8G3S160BM/CT2C8G3S160BM and CT2KIT102464BF160B/CT2CP102464BF160B are exactly the same memory cards, with the only difference being that the CT2K8G3S160BM/CT2C8G3S160BM product is packaged for Macs with the words "Mac Compatible" on the package. But all four of these part numbers are totally interchangeable because they contain identical memory cards. So if you determine that this is the right memory for your computer, just get whichever of these four Crucial part numbers is cheapest :-) I purchased the CT2K8G3S160BM/CT2C8G3S160BM on Amazon because it was $30 cheaper than the CT2KIT102464BF160B/CT2CP102464BF160B product listing at the time (of course, prices can vary each day). Both of these products are dual-voltage and can work in either 1.35V PC3L/DDR3L or 1.50V PC3/DDR3 memory slots. Both products are Mac-compatible, but they are also not Mac-specific or PC-specific, and they work equally well with PCs, Macs, and Chromebook/Chromebox.

If my review helped you to make an informed buying decision, please click the [Yes] button below. If not, please offer suggestions for how I can improve this review. If you have questions, please ask.
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on April 5, 2014
I was looking for an upgrade for my Macbook Pro 13” (mid 2012), and after many days of indecision and seek information between CORSAIR VENGEANCE and CRUCIAL, i do finally bought CRUCIAL 16GB KIT.

I’m an IT Database Manager, and i wanted to run Virtual Machines on my mac, now i’m able to run VMs (Linux OS running Oracle Databases and Windows VM with SQL 2012). Everything works very smoothy and pretty awesome.

So i do recommend the 16 GB Crucial Memory kit. It works despite what apple says about just supporting 8 GB of RAM, so i hope this review help you. i also post some photos.

I ordered Prime and within three days i received ‘em… Great shipping services…
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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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