Chosen Solution
I already have a 3TB Fusion drive. But I want to upgrade to a M.2 SSD. Is this possible?
No. The Samsung 970 PRO SSD is a PCIe SSD; your iMac doesn’t have that interface. You can get a SATA SSD such as the Samsung 860 EVO, plus a 2.5”-to-3.5” drive adapter to allow it to properly fit in the space currently occupied by your Fusion drive.
Not that simple! First you’ll need to break the Fusion Drive set How to split up a Fusion Drive first! As for upgrading your current Blade SSD, yes you can do that but I wouldn’t recommend setting up a Fusion Drive set again as a larger SSD is better running in a dual drive config straight up. Review this great guide on the different custom Apple SSD’s The Ultimate Guide to Apple’s Proprietary SSDs I would recommend getting a 500 GB or 1 TB blade SSD set it up as your boot drive with your applications and use your current HDD as your data drive holding your stuff. Switching out the HDD for a SSD while doable won’t give you the best performance.
The 27” iMac Late 2013 can use PCIe drive. *This model has a SATA III (6 Gb/s) connector for a 3.5" hard drive as well as a proprietary PCIe connector for an SSD. If the SSD is not installed at the time of purchase, the connector still is present and later professional or self-installation is possible. So yes. It can be done.
