Summary: I was able to install myself and called for technical support for what I needed to do after they were in place for computer to recognise. I also did safety things not mentioned-unplugged computer, My memory were in a tiered fashion also not mentioned in info page. These points were from my friend who has been in business 30 years doing computer build,repairs. I have to upgrade my internet service tosee if work better.
Summary: Got this for my wife's mid-2010 iMac. The situation was a bit different than the previous reviewer, the factory memory was installed in the bottom slots. After struggling with the clamshell packaging that wouldn't let go of the sticks unless it was shredded to tiny pieces, we installed this new memory in the top slots. This was a bit tricky - the key was to press them in quite hard. Sealed it up, turned it on and it immediately booted fine - no beeping.
Summary: I love the upgrade. Great deal and works perfectly on my MacBook Pro 15" Unibody (Late 2008). No issues so far. My only complain (therefore -1 star) is that the memory is soooooo difficult to be removed from the plastic packaging. After removing it I actually see one tiny silver thingie broke off from the back of the memory.
Summary: I had mixed results with this product. It did not work in my Gateway NV57 series laptop. Just for giggles I tried it in my MacBook Pro, and it worked great. Was not planning on upgrading my MacBook but once I saw the results of going from 4G to 8G there was no turning back.
Summary: First of all, this is a great deal at $34 after rebate. No regret on the purchase and Amazon is great. However, be aware of two things: 1. The packaging is terrible. The RAM is extremely hard to get out. After playing around for a while, the best way to take out the RAM, IMO, is to flip the package over and gently "push" the RAM out from the other side.
Summary: Installed on 2011 iMac 27" running Lion. At first when I inserted these two sticks in the empty slots and turned the computer back on it was beeping and wouldn't start. I ended up having to remove the two 2GB sticks from their top position to the bottom. I then installed the new Corsair sticks in the top left and right slots. Computer is running great now and showing 12GB of RAM.