Upgrading an older iMac's PCIe SSD: Third-party solutions that save you beaucoup bucks
128GB FUSION DRIVE PCIe SSD Apple iMac 21.5" A1418,27" A1419 Late 2013,2014,2015 | eBay
2013 iMac teardowns reveal SSD slots, soldered-in CPU in the 21.5” model | Ars Technica
Upgrade/Install PCIe SSD in a 21.5-inch iMac(Late 2013)
Upgrading an older iMac's PCIe SSD: Third-party solutions that save you beaucoup bucks
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iMac 27" late 2012 SSD upgrade - Ask Different
The OWC Aura Pro X2 SSD Review: An NVMe Upgrade For Older Macs
How to Install/Upgrade the PCIe SSD in a 27-inch iMac (Late 2013) on Vimeo
M key M.2 PCIe NVMe SSD Adapter for MACBOOK Air Pro 2013 2014 2015 2016 2017 A1465 A1466 A1398 A1502 iMAC A1418 Mac mini A1347|m.2 pcie|pcie m.2 ssdm.2 pcie ssd - AliExpress
How to Speed up your iMac with a NVMe 960EVO M.2 SSD - YouTube