The DDR3 1,066MHz modules are available in 2GB and 4GB capacities, allowing combinations of 1x2GB ($38), 2x2GB ($68), 1x4GB ($330), 6GB (1x2GB and 1x4GB, $365), and 2x4GB ($637). The upgrades are compatible with the 13-inch, 15-inch, and 17-inch MacBook Pros.

Apple's MacBook Pro models ship with 4GB of RAM (with the exception of the 13-inch 2.26GHz laptop, which comes with 2GB of RAM) but can hold up to 8GB of memory. Upgrading the RAM to the maximum 8GB through Apple's online store can add $1,000 to the cost of your MacBook Pro.--