iMac Late 2014/Early 2015 27" Memory Upgrade guide (iMac15,1) Rod Bland September 18, 2019 02:33 Updated Follow Use this guide to upgrade the RAM in your Late-2014/Early-2015 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 Related articles Choosing the Best RAM Upgrade Option iMac Late 2012-2017 27" HDD Replacement guide (iMac13,2 / iMac14,2 / iMac15,1 / iMac17,1 / iMac18,3) How to install Memory (RAM) in an Apple Mac Laptop / Notebook 2.5-inch SSD Installation Guide for Mac Systems (by Crucial)