iMac Late-2012 21.5" RAM Upgrade guide (iMac13,1) Rod Bland September 18, 2019 02:33 Updated Follow Use this guide to upgrade the RAM in your Late-2012 21.5" iMac to a maximum of 16GB (8GB x2). Tools iMac General Servicing Kit iMac Opening Tool Anti-static wrist strap Medium Anti-static mat Parts 4GB RAM Module 8GB RAM Module Related articles iMac Late-2012 21.5" Hard Drive / SSD Upgrade guide (iMac13,1) iMac Late-2013 21.5" RAM Upgrade Guide (iMac14,1 / iMac14,3) iMac Late 2013 27" Memory Upgrade guide (iMac14,2) iMac Mid-2017 27" Memory Upgrade guide (iMac18,3) iMac Late-2013 21.5" Hard Drive Upgrade Guide (iMac14,1 / iMac14,3)