Mac Pro 2009-2012 Repair (2009, 2010, 2011, 2012) - iFixit
A-Tech for Apple 2GB DDR3 1067MHz / 1066MHz PC3-8500 SODIMM Memory RAM Module for MacBook, MacBook Pro, iMac, Mac Mini - (Late 2008, Early 2009, Mid 2009, Late 2009, Mid 2010) Models at Amazon.com
Amazon.com: A-Tech 32GB Kit (4x8GB) RAM for Apple Mac Pro Early 2009, Mid 2010, Mid 2012 (4-Core, 6-Core, 8-Core, 12-Core) | DDR3 1066MHz PC3-8500R ECC RDIMM 2Rx4 1.5V 240-Pin Registered DIMM Memory
Mac Pro 4,1 (Octa Core, Early 2009)
Apple Mac Pro A1289 MacPro4,1 (Early 2009/Nehalem) Eight Core Intel Xeon 2x: E5520 @ 2.26GHz / 10GB Hynix & Micron DDR3 Ram / 500GB Western Digital WD5000AAKX HDD / OS X Mountain
Mac Pro (Early 2009) - Technical Specifications
apple-history.com / Mac Pro (Early 2009, Dual CPU)
How to Install Memory (RAM) in an Early 2009 Mac Pro - YouTube
Mac Pro 5,1 (2009) |12-Cores 3.3GHz | 96GB RAM | 1TB NVMe + 2TB SATA | RX580 8GB for Sale in Bellevue, WA - OfferUp
128GB Memory Upgrade for Apple Mac Pro 2009-2010
Mac Pro (Early 2009) | Low End Mac
Mac Pro Memory Model 4.1 to 5.1 | DDR3 1066MHz | 4GB | MacMemory.com
Apple Mac Pro Desktop Computer Workstation (Early 2009)
8GB Kit (2 x 4GB) PC3-8500 RAM for Apple Mac Mini Early 2009 MB464LL/A
32GB Memory Kit for 2009 - 2010 Apple Mac Pro Tower
Retro Review: 2009 Mac Pro in 2022 | iMore
OWC 32GB (2 x 16GB) PC10600 DDR3 ECC-R 1333MHz DIMMs Memory Compatible with Mac Pro Early 2009 & Late 2010 'Nehalem' & 'Westmere' Systems and Early 2009 Xserve. (OWC85MP3S9M032K) at Amazon.com
Building up a Mac Pro 4,1 (Early 2009)...do I need ti update my RAM? : r/ macpro
MAC PRO early 2009: 1333 RAM memory running at 1066 (2Rx4 model) | MacRumors Forums