Apple iMac 27" Late 2013 NVMe PCIe SSD Upgrade - if you are still using the original 'spinning' hard disk or fusion drive we have some great upgrades for... | By UKSL
How to Install/Upgrade the PCIe SSD in a 27-inch iMac (Late 2013) on Vimeo
iMac Late 2013 27インチに内蔵SSDを追加しFusion化 | Mac好きの凡人日記 - 楽天ブログ
How to Install a PCIe SSD in a 27-inch iMac (Late 2013)