Does your old MacBook Pro need some extra speed? With an extra RAM module, you can expand the memory and make your MacBook a bit faster. You can place a maximum of 8GB DDR3 RAM in a MacBook Pro 13 inches from early 2009. This internal memory runs at a speed of 1066MHz. For example, if your MacBook Pro only has 4GB RAM, you can double that amount when you expand the memory to 8GB RAM.