OWC Mac Pro (Late 2013) Storage upgrade for photographers - Camera Jabber
Amazon.com: PCIe NVMe Gen3x4 SSD 1TB 512GB 256GB 128GB 3D TLC NAND Flash Hard Drive SSD Replacement for Macbook Air 2013-2017, Macbook Pro Retina 2013-2015, iMac 2013-2017, Mac Pro 2013, Mac Mini 2014 (1TB) : Electronics
How to Install an SSD Card into a 21.5-inch iMac (Late 2012–Early 2013) on Vimeo
SSD Upgrades for Apple iMac 27-Inch Late 2013 - 2019