Crucial 8GB Kit (4GB x 2) DDR3

✔SALE: 12% OFF Crucial 8GB Kit 4GB x 2 DDR3 1066 MT/s PC3-8500 CL7 SODIMM 204-Pin Mac Memory CT2K4G3S1067M... 4.8 out of 5 stars CONSUMER REVIEWS(554) Increases system performance Compatible with Mac systems All memory stick modules extensively tested at the component and function level Meets or exceeds, Apple's quality standards and requirements Identical to DDR3L Price: $89.99 Deal Price: $79.99

Description CT2C4G3S1067M is an 8 GB kit consisting of (2) 4 GB DDR3 Notebook modules that operates at speeds up to 1066 MT/s and has a CL7 latency. It is Unbuffered and is non-ECC. It conforms to the industry standard SODIMM layout of 204-Pins and is compatible with computers that take DDR3 SODIMM memory. I bought this upgrade to the 2 x 2GB sticks in my Mid-2010 Macbook Pro 15" i5. I had no compatibility issues and it produced a very noticeable speed boost. If you feel your Mac is in need of more memory, I would recommend the following to know if your RAM is the issue: Open Utilities folder -> Open "Activity Monitor" -> Click the tab at the bottom labeled "System Memory" -> Just below that, you should see a few sets of data...The important ones are:"Free" : If your "Free" memory is low (or 0!) you probably need more memory."Page Outs" : If the "Page Outs" is high, this means that your computer is using hard disk rather than RAM for memory functions and produces a severe loss in speed."Swap Used" : This gives a rough estimate of how much hard disk is used for RAM. This will give you a rough idea of how much RAM you should add. i.e. if this is 4 GB, then you should add at least 4 GB...