Macbook Pro RAM upgrade
The 2nd generation MBP, unibody (hidden battery), has two DDR3 ram slots.

MBP C2D: Year 2008~10
DDR3 1.5V PC-8500S /10600S, Max. 8GB(4GB*2)

MBP i5/i7: Year 2010~12
DDR3 1.5V PC-10600S or DDR3L 1.35V PC3L-12800s, Max. 16GB(8GB*2)