Does my old iMac have a pcIe slot?
I have a iMac (Retina 4K, 21.5-inch, Late 2015) and it has 256GB SSD storage
I want to know if I can upgrade nvme ssd.
iMac 21.5″, macOS 11.2
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2015 iMac (27" and 21.5") have Apple's propriety NVME PCI-e slot.
Unfortunately, the slot (only 1) is located on logic board and required complete dissemble, in order to access that.
I highly discourage anyone to DIY, unless you really know how to or willing to take the risk.
In the mean time, external USB 3 SSD can serve most of speed need.