2009 MacBook Pro non Retina includes includes 2 Double Data Rate Small Outline Dual Inline Memory Module (DDR3) slots visible after replacing the bottom case of the computer. The base model comes with 4GB (2 GB x 2 Slots) memory which can be upgraded up-to 8GB (4GB x 2 Slots).
The Double Data Rate Small Outline Dual Inline Memory Module (DDR3) can be used in this model of MacBook Pro if it meets the following specifications:
30mm (1.18 inch)
2 GB or 4 GB
PC3-8500 DDR3 1066 MHz type RAM
Mac Book Pro Optimization Service Plano