How to Upgrade MacBook Pro RAM, Early 2009, 17-Inch: EveryMac.com
Mid 2009 MacBook Pro in 2020 : r/mac
How to upgrade a Mac: Swap in new RAM, graphics card, hard drive and more | Macworld
It's old as heck but still kicking! Mid 2009 MacBook Pro (MacBook Pro 5,5) I'm hoping to use opencore legacy patcher to install Monterey on it. : r/macbookpro