iMac 2009 24" RAM Upgrade Guide (iMac9,1) Rod Bland September 18, 2019 02:35 Updated Follow Use this guide to upgrade the RAM in your 2009 24" iMac to a maximum of 8GB (4GB+4GB). Tools Phillips #1 Screwdriver Spudger Anti-static wrist strap Medium Anti-static mat Parts 2GB RAM Module 4GB RAM Module