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Product Specs:
OWC Memory fully meets Apple's specifications with special attention to proper thermal specifications.
Memory Trade in
Save money by trading in your original chips! View available memory rebates.
From the purchase date of qualifying memory from OWC, you have 60 days to trade-in your old memory for a cash rebate!
Just fill out OWC's online rebate form or contact OWC Customer Service after you receive and install your new memory.
This OWC Memory is compatible with... Learn how to find your Mac's model ID or PC specs
MacBook
MacBook (Mid 2009)
(May, 2009)
Model ID: MacBook5,2
2.13GHz
iMac Intel
iMac (24-inch Early 2008)
(April, 2008)
Model ID: iMac8,1
2.8GHz, 3.06GHz
iMac Intel
iMac (20-inch Early 2008)
(April, 2008)
Model ID: iMac8,1
2.4GHz, 2.66GHz
PC Laptop
PC Laptops
Compatible with Intel / AMD Process based PCs capable with the specifications listed above. Memory complies with JEDEC Specifications, document JESD79-3B.

Customer Ratings

Write a Review 4.9 / 5 15 out of 15 (100%) reviewers would recommend this product
Verified Buyer
Reviewer: Anonymous Age: 55-65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 The memory works fine. February 1, 2016 This memory module was easy to install on an iMac (24-inch, Early 2008) to make the maximum memory available 6 GB instead of the 4 GB as originally advertised.Works perfectly.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Age: Over 65 Experience Level: Home User
Rating: 5/5 Adds memory to older iMacs limited to 4GB. January 22, 2016 Helps when your opening more than a few apps on your older iMac (08'). Noticeable improvement and a worthwhile investment!

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Tokyo, Japan Age: 45-54 Experience Level: Home User Owned Product: 1-3 months
Rating: 5/5 Ordered from Overseas - No Problems :) December 15, 2015 I live in Japan and ordered some memory for my 2008 iMac. The online service rep confirmed that my iMac would recognize 6GB, so I ordered a 4Gb module and installed it with my factory 2GB module. Thank you for the great customer service. My mac is now running much quicker. If you live overseas, don't hesitate to order from OWC!

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Age: 45-54 Experience Level: IT Professional Owned Product: less than a month
Rating: 4/5 This memory upgrade renewed my old 2008 iMac July 26, 2015 A breath and new life for my 2008 iMac, now it's 6 GB and I have chance to use it for some years.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Guadalajara, Mexico Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Worked perfectly July 11, 2015 I bought this 4gb memory to upgrade my iMac, which had 2 2gb modules in it. The most it will take is 6gb, so I wanted to replace only one of my 2gb mods, but was worried about compatability with the remaining mod. It was not a problem, and now with my 50% memory upgrade, Yosemite is running better with less beach balling.

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: California Age: 55-65 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 The product has great features March 20, 2015 Since the memory in a computer is so critical to the computer performace, I need a "trusted" supplier...

OWC is the perfect supplier to any Mac products. Thanks for the services including shipping, quality, etc.

Thanks again.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Monticello, IL Age: 45-54 Experience Level: Home User Owned Product: less than a month
Rating: 5/5 Works Great, Amazing Delivery February 19, 2015 Ordered this 4GB RAM module about 8:30PM, and my wife texted the next day at Noon to say it had arrived already! Admittedly I'm already in Illinois, but I didn't pay any extra for express shipping, but was amazed at the 16hr door-to-door. Easy installation (I did watch the video, which was all the info needed), and product is working great. Should have done this long ago.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Alberta
Rating: 5/5 Great product February 15, 2015 Shipped quickly; no problems.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Asheville, NC Age: Over 65 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Increasing iMac RAM beyond Apple's specs January 29, 2015 As usual, OWC provides quality and service beyond the norm. According to Apple the maximum RAM that can be used in my wife's mid-2009 iMac is 4GB. Not true! OWC offers a 4 GB RAM module that allowed me to increase the iMac's memory to 6GB (2GB + 4GB). As far as I can determine no one else offers this upgrade.

Upgrading the iMac's RAM is easy to do. I took me all of ten minutes (I move slowly) and the installation went without a hitch.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous
Rating: 5/5 Great product, prompt postage, excellent experience! January 11, 2015 I recently purchased a 4GB stick of RAM to boost my aging iMac's performance. OWC offered the best price and posted very quickly. The RAM installed fine and is now performing flawlessly. Enjoying a significant boost to general performance.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Dublin, Ireland
Rating: 5/5 Upgraded iMac from 4GB to 6GB - works great January 7, 2015 I have an early 2008 iMac (3.06 GHz Intel Core 2 Duo) that Apple says can only support 4GB memory. I bought this 4GB module and used it to replace one of the two 2GB modules that my iMac came with. The machine now has a total of 6GB and works great. It has made an incredible difference to the performance of OSX Mavericks and extended the lifetime of the machine significantly. The only drawback is I felt the module is a little on the expensive side. It is worth it, though.

I would recommend this item to a friend!

Verified Buyer Top 250 Contributor
Reviewer: Anonymous Location: dimples Age: 55-65 Experience Level: Power User Owned Product: less than a month
Rating: 5/5 works great, fit perfectly November 30, 2014 Bought this ram to upgrade an older iMac capable of running 6 GB. Installation was easy just 1 screw to remove the bottom air vent. Machine will now run protools, Digital Performer without out of memory errors. Ram has been running for months now without issue.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Raleigh, NC Age: 45-54 Experience Level: Power User Owned Product: 1-3 months
Rating: 5/5 Makes OS-X 10.9 Mavericks fly October 30, 2014 I installed this 4GB RAM module to upgrade my iMac to 6GB, from an original 2x2GB.

Prior to this memory upgrade OS-X 10.9 was very slow and user switching took 30-90 seconds and was always painfully slow. BTW, OS-X 10.7 was very fast on this iMac with no performance issues at all. I tried to speed up the computer by turning off many programs running in the background and even disabled memory compression but all of this had minimal impact upon the sluggish painful performance of my once fast iMac. My only resort was to reboot every time I wanted to use the iMac and then after about 30 minutes of use it was running very slow once again.

I figured I needed to install an SSD (expensive) or more memory but was concerned that I could only max out at 6GB. After installing the 4GB module I now have 6GB of RAM and am shocked at how much faster the iMac is and user switching is now very fast once again. OS-X 10.9 does not work well in only 4GB it needs 6GB or more. Interestingly, when I cold boot into OS-X 10.9 the RAM usage wants to be near 3-4GB even with very few programs running so the OS really wants more than 4GB of RAM.

If you have a slow 2008 iMac with only 4GB then spend the ~$100 and buy the 4GB module it will revitalize your iMac.

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Colorado Age: 45-54 Experience Level: Power User Owned Product: over 6 months
Rating: 5/5 Quality Ram May 9, 2014 Needed more ram for my iMac (2009) and this fit the bill. Since I already had 4 gigs and the most I could put into my computer was 6 gigs. So I got the 4 gig stick and it works perfectly!

I would recommend this item to a friend!

Verified Buyer
Reviewer: Anonymous Location: Richmond, IN Age: 45-54 Experience Level: IT Professional Owned Product: over 6 months
Rating: 5/5 Completely safe April 3, 2013 I'm a skeptic, so when I read that I could use a RAM stick in my MacBook that would allow 6 GB of RAM instead of Apple's maximum of 4 GB, I took it as difficult to believe.

I've never had trouble from OWC RAM, but Apple should know what is electrically-compatible with their systems. To exceed those limits should be dangerous.

The machine has performed beautifully with the extra RAM and I've not seen one glitch because of it. My skepticism was changed to confidence in OWC's testing.

I would recommend this item to a friend!

OWC Memory 4.0GB 4.0GB PC6400 DDR2 Mfr P/N: 6400DDR2S4GB OWC SKU: OWC6400DDR2S4GB OWC Memory Upgrade Module Lifetime OWC Limited Warranty Ships: Same Day only $107.99
Add to CartOther World Computing 6400DDR2S4GB In Stock, Click to Buy Now