Well… it’s not that simple! So while you could swap out your current drive, Apple uses a custom interface for their blade SSD drives iMac Intel 27" EMC 2639 Blade SSD Replacement while OWC offers a pin compatible drive which is blessed by Apple, some people try to force in a M.2 SSD using an adapter.
The problem here is Apple never published their standard and only OWC reverse engineered it! They were able to strong arm Apple which is why they are the only true compatible drive.
Now jumping back to M.2 SSDs there are a good handful of different units out there I’m not even talking about manufacturers! The standard offers five different generations in three different sizes! Some won’t be any faster than what you have. And even the ones that are your systems can’t support them as those are much newer.
Here’s a great read on what Apple produced The Ultimate Guide to Apple’s Proprietary SSDs as we can see your systems Blade drive port is just a different flavor of SATA! That your current drive is using as well via the standard SATA port.
So unless you need more storage using a dual drive config. It’s not worth it!
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