OWC 16GB (4 x 4GB) DDR3 1066MHz SO-DIMMs RAM Upgrade for iMac 21.5 and 27 (October/2009)

OWC MEMORY: Memory made for your Mac.

At OWC, our goal is to help your Mac perform faster and last longer. That's why we engineer memory specifically tested and optimized for Mac, with options available for nearly every upgradeable Apple computer, from the PowerMac G4 to the latest 2017 iMacs. We make it easy to upgrade your Mac's performance yourself, providing step-by-step install videos and included toolkits.

OWC memory is engineered for exceptional compatibility with your Mac. We start with the highest-quality components and create memory to the precise speed, capacity, and programming specifications of almost every upgradeable Apple computer. The result is JEDEC-compliant memory that's a perfect fit for a faster Mac.

OWC's rigorous quality control includes hand-checking and testing at each step of the manufacturing process. But our commitment to excellence doesn't stop there. We own and maintain state-of-the-art facilities that feature nearly every Mac model from the past two decades. This allows us to relentlessly test for quality, reliability, and optimal performance in actual machines. It's the OWC Difference.

We're laser-focused on helping you get the absolute most from your Mac. That's why we test the true memory limit of each Apple computer, often finding that they support more memory than the official factory maximum. With OWC memory, you can truly max out your Mac with up to double the factory-supported limit.

Adding OWC memory to your Mac is one of the best ways to extend its life and accelerate its performance. It's also an upgrade you can easily install yourself, thanks to our library of step-by-step installation videos.

Our OWC 16.0GB (4 x 4GB) PC8500 DDR3 1066 MHz 204-pin Memory Upgrade Kit is compatible with iMac 21.5-inch and 27-inch models from late 2009. It's a JEDEC-compliant, RoHS-compliant, and warranty-safe upgrade that meets or exceeds all Mac specifications.

With industry-leading advanced replacement and a limited lifetime warranty, including free technical support from Other World Computing, you can trust OWC memory to deliver superior performance and reliability for your Mac. Tap into your DIY spirit and unlock the full potential of your computer with OWC memory upgrades.

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