“MacBook Pro 2009 Model Is this compatible with a Apple MacBook Pro 2009 Model?”
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I just purchased the PNY 4GB RAM for my MacBook Pro. It didn't work when I was running OS X 10.3. I upgraded to 10.6 and then directly downloaded 10.10. After the upgrade, the RAM worked perfectly. Now I have 8GBs in the laptop. Make sure you get the RAM on sale or price matched. Bought it for $30.
If it takes RAM with the specified capacity and number of pins.
YES! Just installed one in my 2009 Macbook Pro!
Macs are incredibly finicky. The PNY did not work for my 2009 MBP. Other world computing has the RAM you want