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Crucial 8GB Kit (4GBx2) DDR3 1333 MT/s (PC3-10600) CL9 SODIMM 204-Pin 1.35V/1.5V Notebook Memory Modules CT2KIT51264BF1339

4.7 out of 5 stars 896 customer reviews
| 247 answered questions

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8GB KIT (4GBx2)
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  • Increases system performance
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  • Premium quality memory from a trusted brand
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16 new from $44.50 4 used from $36.74 1 refurbished from $143.30

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$49.99 & FREE Shipping. Details In Stock. Sold by WHOLESALE TAG and Fulfilled by Amazon. Gift-wrap available.

Frequently Bought Together

  • Crucial 8GB Kit (4GBx2) DDR3 1333 MT/s (PC3-10600) CL9 SODIMM 204-Pin 1.35V/1.5V Notebook Memory Modules CT2KIT51264BF1339
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  • Samsung 850 EVO - 250GB - 2.5-Inch SATA III Internal SSD (MZ-75E250B/AM)
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Compare to Similar Items


This item: Crucial 8GB Kit (4GBx2) DDR3 1333 MT/s (PC3-10600) CL9 SODIMM 204-Pin 1.35V/1.5V Notebook Memory Modules CT2KIT51264BF1339
Customer Rating 4 out of 5 stars (896) 5 out of 5 stars (1400) 4 out of 5 stars (5130) 5 out of 5 stars (2833)
Price $49.99 $40.36 $35.98 $42.99
Shipping FREE Shipping FREE Shipping FREE Shipping FREE Shipping
Sold By WHOLESALE TAG Amazon.com Amazon.com Amazon.com
Capacity 8 GB 8 GB 8 GB 8 GB
Number of Items 1 2 2 2
Memory Storage Capacity 4 GB 4 GB 4 GB 4 GB
Memory Clock Speed 1333 MHz 1333 MHz 1600 MHz 1066 MHz
Ram Memory Technology DDR3 1333 DDR3 1333 DDR3 1600 DDR3 1066
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Product Description

Capacity: 8GB KIT (4GBx2)

CT2CP51264BF1339 is an 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.

Product Information

Capacity:8GB KIT (4GBx2)

Technical Details

Collapse all
Summary : Screen Size, Screen Resolution, Graphics Coprocessor, Graphics Card RAM
RAM 4 GB DDR3 1333
Memory Speed 1333 MHz
Brand Name Crucial
Item model number CT2CP51264BF1339
Item Weight 1.8 ounces
Product Dimensions 7 x 0.4 x 5 inches
Item Dimensions L x W x H 7 x 0.44 x 5 inches
Computer Memory Type DDR3 SDRAM
Voltage 1.35 volts

Additional Information

ASIN B0067G1N34
Customer Reviews
4.7 out of 5 stars 896 customer reviews

4.7 out of 5 stars
Best Sellers Rank #1,148 in Computers & Accessories > Computer Components > Memory
Shipping Weight 1.4 ounces (View shipping rates and policies)
Domestic Shipping This item is also available for shipping to select countries outside the U.S.
International Shipping This item is not eligible for international shipping. Learn More
Date First Available November 24, 2011

Warranty & Support

Amazon.com Return Policy:You may return any new computer purchased from Amazon.com that is "dead on arrival," arrives in damaged condition, or is still in unopened boxes, for a full refund within 30 days of purchase. Amazon.com reserves the right to test "dead on arrival" returns and impose a customer fee equal to 15 percent of the product sales price if the customer misrepresents the condition of the product. Any returned computer that is damaged through customer misuse, is missing parts, or is in unsellable condition due to customer tampering will result in the customer being charged a higher restocking fee based on the condition of the product. Amazon.com will not accept returns of any desktop or notebook computer more than 30 days after you receive the shipment. New, used, and refurbished products purchased from Marketplace vendors are subject to the returns policy of the individual vendor.
Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.

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Customer Reviews

Top Customer Reviews

Size: 16GB KIT (8GBx2) Verified Purchase
I ordered this to upgrade the RAM in a Feb 2011 2.0 GHz 15-inch MacBook Pro. According to Apple, this model only supports up to 8 GB. But OCW found that it can support 16 GB. I bought with a little hesitation, but safe in knowing that if it didn't work, Amazon would allow me to return it and get a refund.

It has worked great, like every other Crucial brand product I have ever bought. My next upgrade purchase will likely be a Crucial solid state drive.
1 Comment 72 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 16GB KIT (8GBx2) Verified Purchase
Great product, works well in my Dec 2011 13" MacBook Pro, 16GB inserted and recognized with no issue. Installation was a breeze too. I'd say the hardest part wasn't the memory swap, but rather not loosing any of those tiny screws the MacBook case uses.
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By DawgFan on August 12, 2013
Size: 16GB KIT (8GBx2) Verified Purchase
I bought this upgrade for my 2009 iMac 27" i7. I already had 4 x 2GB sticks in my iMac, but needed more speed for Photoshop and Final Cut Pro. I installed 2 x 16GB along side 2 x 2GB sock memory (YES YOU CAN DO THAT!) to give me a total of 20GB. I had no compatibility issues and it produced a very noticeable speed boost. If you feel your Mac is in need of more memory, I would recommend the following to know if your RAM is the issue: Open Utilities folder -> Open "Activity Monitor" -> Click the tab at the bottom labeled "System Memory" -> Just below that, you should see a few sets of data...The important ones are:

"Free" : If your "Free" memory is low (or 0!) you probably need more memory.
"Page Outs" : If the "Page Outs" is high, this means that your computer is using hard disk rather than RAM for memory functions and produces a severe loss in speed.
"Swap Used" : This gives a rough estimate of how much hard disk is used for RAM. This will give you a rough idea of how much RAM you should add. i.e. if this is 4 GB, then you should add at least 4 GB.

You should check these numbers while doing the types of activities you normally use your computer for. Not just at idle with nothing running!

As far as this item goes, Crucial is a known Apple-friendly RAM and is unlikely to give you any issues. It is also a high quality manufacturer and is much more reliable than some cheaper brands. Remember, RAM is dirt cheap these days so don't save a few $$ to buy inferior quality RAM! You should just not buy any if you are going to buy a terrible brand.

iMac install is really easy! You can find many manuals on the internet (I prefer iFixit). Don't be intimidated buy installing it. You can save a lot of money by doing it yourself. If you feel uncomfortable, then by all means have someone qualified to do it for you.
1 Comment 23 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Size: 16GB KIT (8GBx2) Verified Purchase
I have a late-2011 15" Macbook Pro, 2.2 GHz i7 with OS X 10.7.4. Apple officially supports up to 8 GB of RAM, but this went in without a problem and was recognized by the OS easily.

The only thing you'll need is a #00 philips screwdriver. I bought mine from Radio Shack for $7 (it came in a kit).

Then, take off 10 screws on the bottom, pop off the aluminum plate, pop off the existing RAM, stick the new RAM in its place, and voila! There are several Youtube videos showing the entire process. It took me 15-20 minutes from start to finish.

This has different part numbers from the Crucial website, but works just the same.
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Size: 8GB KIT (4GBx2) Verified Purchase
I bought these after I upgraded using another companies ram that failed after 6 weeks and these work like a charm. No problems at all and allow me to use my 16gb ram to the fullest! I was a little concerned with the dual voltage but I have had absolutely no problems with them!
2 Comments 14 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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By James on February 15, 2014
Size: 16GB KIT (8GBx2) Verified Purchase
I went by the ratings already found under this product, and everything worked out great -- my computer is much snappier, and the RAM is still going strong.

Specs, copied directly from "About this Mac":

21.5-inch iMac, Mid 2011
Processor - 2.5 Ghz Intel Core i5
Memory - 20 GB 1333 MHz DDR3
Graphics - AMD Radeon HD 6750M 512 MB
RAM slots are 2 GB, 2 GB, 8 GB, 8 GB
with the 8 GB's being the ones I purchased from Crucial.
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Size: 8GB Verified Purchase
Recently got an Acer V5-122P. Looked everywhere, even Acer has the specs to be maximum RAM of 6GB, 2 onboard, and 4GB in slot. After some searching, Crucial claimed that this 8GB SODIMM would work. I gave it a shot. Works great. The notebook now has 10GB. BIOS and W8 both picked it up right away.
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Size: 16GB KIT (8GBx2) Verified Purchase
Installed these memory chips in my mid 2011 iMac and had no problems. I chose the Crucial chips because of good reviews on iMac forums. Also, the fact that Amazon had a good deal did not hurt either.
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