How to Install a PCIe SSD in a 27-inch iMac (Late 2013)
hard drive - iMac 27" late 2012 SSD upgrade - Ask Different
SSD Upgrades for Apple iMac 27-Inch Late 2013 - 2019
Amazon.com: INDMEM 512GB NVMe PCIe SSD 3D TLC NAND Flash Hard Drive Disk 512G Only for Late 2013 - Mid 2015 MacBook Pro, Mid 2013-2017 MacBook Air, Late 2013-2017 iMac, Late 2013
The OWC Aura Pro X2 SSD Review: An NVMe Upgrade For Older Macs
How to Upgrade/Replace the PCIe SSD in a 21.5-inch iMac (Late 2013) iMac14,1 iMac14,3 - YouTube
Amazon.com: OWC 2TB Aura Pro X2 NVMe SSD Upgrade Kit Compatible with Select 27" and 21.5" iMac Models (Late 2013 - Current) : Electronics
How to Install a PCIe SSD in a 27-inch iMac (Late 2013)
Hard Lesson Learned With Late-2013 Apple Products Containing Lesser Performing 128GB SSDs | The SSD Review