Crucial 8GB Kit (4GBx2) DDR3/DDR3L 1333 MT/s (PC3-10600) SODIMM 204-Pin Memory For Mac - C

Product Description

CT2K2G3S1339M is a 8GB kit consisting of (2) 4GB DDR3 Notebook modules that operates at speeds up to 1333 MT/s and has a CL9 latency. It is dual voltage and can operate at 1.35V or 1.5V. It is Unbuffered and is non-ECC. It conforms to the industry standard SODIMM layout of 204 pins and is compatible with computers that take DDR3 SODIMM memory.

Features

• Increases system performance
• Compatible with select Mac systems
• All memory stick modules extensively tested at the component and function level
• Meets or exceeds, Apple's quality standards and requirements
• Easy installation

Top Reviews

Upgraded my iMac 27-inc, Mid 2011, from 4 GB to 20 GB of total RAM.
by Marco Garibay (5 out of 5 stars)
December 9, 2014

I've added this pair of memory modules to my iMac 27-inc, Mid 2011, to upgrade from 4 GB to 20 GB of total RAM.

Despite the Apple documentation claiming that 16 is the maximum capacity for this model, I researched and found that you can max out to up to 32 GB.

For those people that have no clue (like me), the installation was really easy:
1 - Turn off your iMac. Touch the iMac frame to discharge you (electrostatic), and unplug it from A.C. Place your iMac "face down" in a towel.
2 - unscrew the 3 bolts from the memory bay at the bottom of the iMac, remove the memory cover.
3 - leave the 2 RAM modules in their slots (I had 2 RAM modules, of 2 GB each).
4 - Insert the NEW 2 RAM modules (8 GB each) in the 2 available slots.
5 - Screw the 3 memory cover bolts, get it up back in place and turn it on. That's it.

By looking at the "About this Mac > Memory" screen, I went from:
[ 2 GB ] [ 2 GB ]
[ ] [ ]

To:
[ 2 GB ] [ 2 GB ]
[ 8 GB ] [ 8 GB ]

Hope this helps!
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Great way to add pep to an iMac.
by Jacob (5 out of 5 stars)
April 18, 2015

Works like a charm, went from 4gb on my iMac to the max of 16gb. It is a mid 2011 iMac 21.5" it made a drastic change and installed very easily through the bottom plate on the iMac. The tabs you pull on to remove the old ones are a bit tough. Just use a firm steady amount of pressure and they'll come out.
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I have a mid 2011 mac mini that came with the lame 2GB. I HATED how slow that machine always ...
by Neilly (5 out of 5 stars)
October 22, 2014

In a word OMG. Why the heck did I wait over 2 years to do this!!!!! I have a mid 2011 mac mini that came with the lame 2GB. I HATED how slow that machine always was (and especially after mavericks came out).. It crawled on Yosemite, so being a tech, I knew memory would help. I HAD NO IDEA IT WOULD MAKE THIS THING SIZZLE.. Crucial is the go to brand anyway and the install literally took me 20 seconds, but that's due to the mac mini easy access. However, great product and great price!
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Amazing results! I'm not watching all my icons bounce ...
by Dennis (5 out of 5 stars)
March 7, 2015

I have a MacBook Pro 13-in Late 2011 running OS Yosemite. Before buying this ram I checked my "Activity Monitor" and found that I was constantly using 3.8-3.9 of my 4 GB of RAM. Seriously lagging. I received the package in 2 days and installed 8 GB in about 10 minutes. Amazing results! I'm not watching all my icons bounce around and waiting for them to open. I HIGHLY ENCOURAGE you to upgrade to 8 GB. It's just night and day.
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Looking for better performance. Interesting problem upon installation
by DQD (5 out of 5 stars)
December 28, 2014

iMac 21.5-inch, Mid 2010, 3.2 GHz Intel Core i3

OS X Yosemite 10.10.1

Wanted to upgrade from the base 4GB of RAM provided by Apple. Looking for better performance. Interesting problem upon installation.

Attempt One: Original two 2GB DIMMs were in BANK 0/DIMM1 and BANK 1/DIMM1. Added the new Crucial 4 GB DIMMs to open slots for BANK 0/DIMM0 and BANK 1/DIMM0. Upon startup, the iMac blared the warning horn. Annoying sound. Had to power down holding the power button.

Attempt Two: Swapped one each of the two sets so the DIMMs were in the same banks. Once again the horn alarm upon startup. Power down . . .

Attempt Three: Loaded only the new two 4GB DIMMs in BANK 0/DIMM1 and BANK 1/DIMM1. Booted up fine. "About this Mac" showed 8GB total RAM. Success with new Crucial RAM.

Attempt Four: Keeping the two new Crucial 4GB DIMMs in BANK 0/DIMM1 and BANK 1/DIMM1, loaded the two original 2GB DIMMs into the DIMM0 banks. Booted up. Worked fine. "About this Mac" showed 12GB total RAM. This was the intended end goal. Success with both old Apple/Samsung RAM and new Crucial RAM.

Odd that the old RAM had to be relocated to the open slots. Specs between old and new did match, DDR3 1333 MHz. Have always had success with Crucial RAM in both PCs and Macs. Will continue to recommend Crucial.

Hope this helps other do-it-yourselfers.
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Do. It. Now.
by SRT-6 (5 out of 5 stars)
March 5, 2017

Jumping from the factory original skimpy 4GB of RAM memory all the way up to 32GB of memory with two of these 2X8GB Crucial memory kits was incredibly beneficial for my 27" mid-2011 iMac which I use many hours each and every day and rely upon for both work and fun. I did the upgrade several weeks ago and have never looked back. Now, I have no more pinwheels or spinning beach balls. No more cherry red moving blocks in the "memory" section of Activity Monitor -- just a skinny green line near the bottom of the box. No more buffering for videos. No more nagging error messages with browsers. No more required "force quit" actions. No more unwanted restarts. No more waiting and waiting and waiting for files to load. No more sluggish Time Machine backups. No more annoying crashes or freezes. I can (and do) use two different memory-hungry browsers at the same time with more than 20+ tabs open in each one with absolutely no diminution in performance and huge chunks of memory available to spare. And opening three or four other memory-heavy programs at the same time the browsers are open makes no difference at all to the operation of the iMac.

This was an easy fix and an easy task to complete for someone who is usually not comfortable doing these kinds of things with electronic devices. The process takes about five minutes and is carefully explained in full detail in manufacturer's pages and in helpful YouTube videos available everywhere. Everything worked exactly as prescribed without any glitches or unexpected problems. So, again, "do it now" if you are having problems with your computer and have only the minimum memory supplied by the manufacturer. That's not enough for today's programs, apps and operating systems, and this fix really works.
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Works well in the Mid-2010, 27 inch iMac
by G. Ward (5 out of 5 stars)
July 9, 2015

It can be a little intimidating to order RAM for your Mac outside of the Apple Store since not all products specify your model in their description. Once I went to my "About This Mac" menu, I was able to discern that I own a mid-2010, 27 inch iMac that uses 1333 MHz DDR3 RAM. A quick search of Amazon, lead me to the Crucial 8GB Kit (4GBx2) DDR3 1333 MT/s (PC3-10600) CL9 204-Pin SODIMM Memory For Mac CT2K4G3S1339M (Notebook). This is a 2 DIMM kit, so you will need 2 free slots. Check before you purchase.

With the help of a small screw driver, I used this RAM to upgrade my memory from 8gb to 16gb, by filling the remaining 2 slots. (located directly beneath the display) The whole process took 15 minutes (minus the 2-day shipping:) and the Crucial memory has proven to be completely compatible with my iMac.

I frequently work on 1-1.5gb Photoshop files and I have gotten no memory warnings since installing the Crucial RAM kit.

If you have an aging iMac, I would recommend this Crucial RAM kit to coax a little more life out of it.
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Breathed New Life Into My System
by Kent-o (5 out of 5 stars)
February 12, 2017

My Mid-2011 iMac was ridiculously slow. After running some diagnostics and a full reinstall (you know, like you do with Windows), it was still painfully slow with 4GB-ram. It was obvious that more ram was needed. It's funny, because at 4GB-ram my linux systems scream along at high-speed (Debian 8 and Debian 9) on decade-old Core-2-Duo hardware, but my five-year-old i5 Mac seemed ready for the garbage heap.

I went with 16GB-ram upgrade, 4x4GB, and the difference is breathtaking. Although we should agree that such quantities of ram should be unneeded on a UNIX-compliant system, it has kept me from prematurely upgrading to new hardware.
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I have so much extra memory to use ( great ). Installation was easy
by Mr Bond (5 out of 5 stars)
July 28, 2016

Hi , 13" MBP early 2011 . Just received this yesterday and installed them . I have so much extra memory to use ( great ) . Installation was easy , And my macbook pro recognized the memory right away w/no problem . It is working faster and better no lag time . When i contacted Crucial they said ( if the computer does not recognize the upgrade when you start your computer wait then when your computer starts wait until you here a chime then press , command + option + p + r , All 4 At the same time . Then when you hear the 2nd chime let the keys go and the computer should recognize the upgraded new memory ) . Check w/them just to be sure . I had no such problem it recognized it right away . And when i open iPhoto i used to have to wait for the pic to upload no more their there . I went from 4gb to 16gb of memory and now i have on the average 75% of the 16gb memory available . I'll keep you informed . Thanks. I now have 6 tabs open and i'm at 61% memory available on ( 16gb ) , I could have never done that w/just 4gb of memory . Keeping you informed . Thanks . ( 8-6-16 ) Still no problem i have noticed that the more memory that you have , The more that your app's and other things try to use the memory . That's why i went with 16gb over 8gb upgrade , I'm glad i did ( 8gb upgrade $45 - 16gb upgrade $60 , $15 more for twice the memory . In my option a no brainer . ) Thanks .
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I went from 4GB (2x2) to these 2x2 8GB modules and it's like a new machine
by Joseph Z. (5 out of 5 stars)
October 28, 2016

I have a late 2011 13" Macbook Pro. For those wondering whether it can run 16GB of memory, it works flawlessly. I went from 4GB (2x2) to these 2x2 8GB modules and it's like a new machine, especially with Sierra installed and Siri. I can now keep many apps open at the same time. No more spinning thinking wheel or bouncing app icons. 5 minute install, system recognizes 16GB of memory. Oh and right clicking is instant now.

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