A-Tech4GB Kit (2 X 2GB) DDR3-1066 (PC3-8500) RAM Memory Upgrade for Apple MacBook Pro 13"/15"/17" Mac Mini Core 2 Duo 2.0/2.26/2.53ghz; MacBook 13in Equivalent to Kta-mb1066k2/4g (Genuine Brand)

Was not sure which ram memory upgrade to buy so chanced this one and very glad I did. Unplugged the power source. Twisted off the bottom cover of the Mac Mini and old memory sticks in plain view. Gently pulled them upward and replaced them with the new 2 X 2GB, twisted the bottom cover back on. Re-Plugged the power and checked about this Mac. Memory installed from 2GB to 4GB. So simple I had my 15 year old grandson install them.However, still received message that the disk was full. Researched on-line how to delete files and found that my e-mail messages were part of the problem. Over 15,000 messages (including attachments) as far back as 2009. Deleted all messages up to September 2013, checked and cleared all duplicate files (pictures) also removed Goggle Chrome browser (read on-line could cause problems). My Mac Mini is now very responsive and moving fast again like new.Recommend this upgrade. Love what it did for my Mac Mini. Sometime in the future will purchase the 2 X 4GB which is the max for this system.

Memory upgrade did as I expected. I installed the upgrade memory in a late 2009 Mac Mini. I followed a You Tube video. The job took 45 minutes. I had spinning beach balls and slow program loading since upgrading to Yosemite OS.The Mac Mini booted up quicker. The upgrade's benefit was immediately recognizable.I considered the 8GB upgrade but chose to take a chance on the 4GB.I am pleased with the results.

Recently tried another popular brand of ram for my 2009 Mac Mini, after spending many hours working on it, for whatever reason it would not work in slot 0. Returned that ram and bought A-Tech ram and it worked fine. The only minor issue is, had to reset pram in order for my Mac to recognize the new ram, no big deal.

Works as advertised. My computer was lagging a bit, so I bumped up the RAM. Install took mere minutes, and my computer is much happier...and faster now. Definitely worth the price.

Was very easy to install.. Started up and everything was still there...My laptop runs about twice as fast as before...I wish I did not wait so long to up-grade from 2megs to 4 For me it is a winner ...Thank you...Damian

Well, i fell stupid... this is my first time owning an Apple product and i thought you can upgrade Ram in the macbook air mc503ll/a. well it turns out you cannot. Even thought the first bullet point on this products says "2 X 2GB DDR3-1066 (PC3-8500) RAM Memory Kit for the Apple MacBook Air Mac Notebook 13.3" 1.86GHz 128GB 13.3 1.86GHz 128GB (MC503LL/A)." after spending a few hours doing research on how to accomplish this, I finally found a few blog post telling people it cannot be done (https://discussions.apple.com/thread/2683986?tstart=0). So, i will be returning this and the kit i bought ASAP.IF YOU OWN A MACBOOK AIR DO NOT PURCHASE THIS!!!!! YOU CANNOT UPGRADE MACBOOK AIR RAM

Easy to install. Can actually use my computer again without it taking minutes to load programs. Great product

Delivered on time, and worked beautifully from day one. Would strongly recommend.