iMac Late-2012 27" RAM Upgrade Guide (iMac13,2) Rod Bland September 18, 2019 02:35 Updated Follow Use this guide to upgrade the RAM in your Late-2012 27" iMac to a maximum of 32GB (8GB x4). Tools Spudger Anti-static wrist strap Medium Anti-static mat Parts 4GB RAM Module 8GB RAM Module