How Much RAM Does My 2009 MacBook Pro Support?
There were MacBook Pro updates in January, March, and June of 2009. No matter which model you own, the RAM capacity is 8GB. Each model has two RAM slots that support 1066MHz DDR3 PC3-8500 SDRAM. Find more info about MacBook Pro memory and information about your specific 2009 MacBook Pro.
App Sliced recommends buying RAM from a third-party vendor instead of straight from the Apple Store. The memory quality from Crucial and OWC is comparable or better than Apple branded RAM at a fraction of the price. Find memory deals at App Sliced Memory.