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Install memory in an iMac - Apple Support (HK)
A-Tech 32GB Kit (4x8GB) RAM for Apple iMac (Late 2012, Late 2013, Late 2014, Mid 2015) | DDR3 1600MHz SODIMM PC3-12800 204-Pin SO-DIMM Max Memory Upgrade at Amazon.com
Refurbished Apple iMac 14,2/i7-4771/32GB Ram/1TB HDD/775M/27"/B (Late 2013) | Mac4sale
Apple iMac 27" Desktop - 3.5GHz Quad-Core i7 - 24GB RAM - 512GB SSD - NVIDIA GeForce GTX 775M (2GB) - (2013) - Silver - Best Deal in Town
iMac RAM upgrade: Here's an affordable way to improve multitasking - CNET
Test Apple iMac 27" (2013) : notre avis - CNET France
Apple iMac 27" - Late 2013 Reviews, Pros and Cons | TechSpot
27" iMac (Late 2013) 16GB RAM Upgrade how to - YouTube