MacBook Pro: How to remove or install memory - Apple Support
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
CMS 8GB (2X4GB) DDR3 8500 1066MHZ Non ECC SODIMM Memory Ram Upgrade Compatible with Apple® MacBook Pro Core 2 Duo 2.8 17" Mid-2009 - A35 at Amazon.com
Apple MacBook Pro (13-inch, mid-2009) 2.26 GHz Intel, 250GB SSD, 8GB RAM -Works | eBay
Apple MacBook Pro 15-inch Mid 2009 - 2.66GHz Core 2 Duo Laptop RAM Memory | Kingston
MacBook Pro - Wikipedia
MacBook Pro 13" Unibody Mid 2009 Repair - iFixit
How to upgrade MacBook Pro RAM (2009-2012) - YouTube
Apple MacBook Pro 13 inch (06/09) - Notebookcheck.net External Reviews
How to Upgrade MacBook Pro RAM (2009, 2010, 2011, 2012): EveryMac.com