Timetec 16GB KIT(2x8GB) Compatible for Apple DDR3 1333MHz PC3-10600 CL9 for Mac Book Pro (Early/Late 2011 13/15/17 inch), iMac(Mid 2010, Mid/Late 2011 21.5/27 inch), Mac Mini(Mid 2011) MAC RAM Upgrade

I used this to upgrade my late 2009 27 inch iMac which really needed the boost when I decide to upgrade the OS beyond what Apple normally allows. The install was simple on an iMac and they were recognized by the OS without issue. Doing some checking, it seems the specs are exactly as advertised and when I did a complete memory test I had no errors of any kind.Like most memory for computers you can usually get it to fail by hitting it hard right out of the gate if there is anything wrong with it. No matter what I threw at it, it kept going and didn’t crash meaning that it will probably last a good long time.At this price, it’s well worth it to bring some life to an old system.If you want to upgrade your old Mac to a newer OS, you can look up OpenCore Legacy Patcher and that will get you on the right track.

My 6-year old iMac is thanking me for upgrading the memory. It is now much more responsive and should keep going for at least a few more years. One thing I would suggest that everyone do when upgrading the memory is to run a hardware test before and after the upgrade. On my iMac, you get the hardware test by pressing "D" while starting up (you have to be connected to the internet, though). In my case, I started getting kernel panics after the upgrade and one thing I read was that bad memory can cause this. I tried the hardware test and sure enough, there was a memory error. I put the original memory back to check there was no error in the original memory sticks. I then tried various combinations of different memory sticks and different memory slots (the memory slot can also cause a problem) and the only thing that was consistent was that I would get an error with one particular memory stick. The return process with Amazon was seamless and I ordered another pair of memory sticks. No memory errors with those sticks, so I'm assuming that the bad stick was just a glitch (I've had one other time with a memory stick going bad after a few years). I'm not going to fault the company for what I think was a minor glitch.

I had been struggling to get any performance out of my mid-2011 iMac. It took forever to load programs and multitasking was out of the question. My memory meter constantly showed that I was 60-75% usage at any given time. I bought these cards after reading the reviews and the great price. I added 16gb to the 4gb that I had in the machine, to give me a total of 20gb. Programs load lightening fast and I can have several windows open at a time without any problems. Memory meter shows that I and staying around 20-30% usage. The RAM was easy to install and works great.

I bought this RAM to upgrade my 27" mid-2011 iMac. After the upgrade, I can notice a significant difference—the system is running like a champ with no performance lag. The RAM also comes with a limited lifetime warranty, which is a no-brainer. “Support Small Businesses”

Bought these to upgrade an older (late 2011) Macbook Pro that came with 4Gb of total RAM. Owner manual for the computer says it can be upgraded to 8Gb. Online blogs suggested the computer would recognize 16Gb. So it was an experiment. RAM modules came nicely packaged and the URL timetecinc.com on the package label takes you to their web site where they include some installation tips and guides. Install was easy. Keep track of the tiny screws for the Mac case. DDR memory is stacked one over the other and are truly plug and play to replace. My mac is noticeably faster booting and recognizes the full 16Gb I installed.

I upgraded an old laptops ram from 4 gb total to 16 with this and it made a huge difference. Especially in start up alone. While the computer has other struggles the ram made vast strides towards making it modern computing.

Wife’s mid-2011 iMac had repeating three beeps of RAM death, and decided it was worth a try to buy replacement RAM in the hope of fixing it. Two 8GB sticks showed up faster than expected (two days to Seattle), installation was simple (I’d upgraded my own iMac’s RAM years ago), system recognized the new RAM, no beeps, iMac is better than ever. For the cost of 16GB of RAM, it was totally worth it to extend the life of iMac - thumbs up!

Read the reviews and decided to try to "revive" my very buggy laptop (constant spinning rainbow wheel). It took me less than 10 minutes to remove the 10 small phillips head screws to remove the back of the computer, undo the battery connector, and then remove the two old memory cards and replace them with the new memory cards. The laptop started right up and it recognizes and utilizes the 16GB of new memory (laptop states that it can only be upgraded to 8GB of RAM, not correct). I no longer get the spinning rainbow wheel of "death"!!!! I've been using my laptop for the past week with no issues and I am very happy that I can use my laptop a bit longer. I will probably upgrade to a 1TB SSD hard drive next (hard not to with an average cost of around $70 bucks). Plenty of Youtube videos to show you exactly how to replace the RAM memory cards. Very easy to do, I would highly recommend.