Review on 💾 8GB 1066MHz DDR3 (PC3-8500) Apple Memory Module - 2x4GB SO-DIMMs: Enhanced SEO-friendly Product Name by Andrew Choukline

You will receive two pieces of 4GB each (which you need if you have a laptop because you want the same RAM in each slot, it won't work if only one slot is full ). Arrived quickly with no damage and I've had no problems using their products on my Mac. RAM upgrades are a great way to boost your computer's performance, so it can handle additional system updates, more complex software, and feel like a brand new computer without spending a lot of money. You should check the model of RAM you need. For your specific model (https://support.apple.com/en-gb/HT3011) make sure it's enough (I upgraded from 2-1GB to 2-2GB and found it's not enough, and upgraded to two to 4GB D. You can find out by watching your usage in activity monitor under 'memory' You should have a decent 'free' amount to run at max speed.