An SSD can also be installed in this hard drive space as well.With most Macs these days, soldered memory chips mean that whatever RAM you want, you have to buy it from Apple when you order the machine. However, if you customised your model and it only has a 'Blade' SSD installed, then you can still install a standard SATA 2.5" hard drive in 21.5-Inch models and a 3.5" hard drive in 27-Inch models.
All 'Tapered Edge' iMac's from the Late 2012 iMac13,1 up to the "Mid-2017" iMac18,3 models have a 6 Gb/s Serial ATA (Revision 3.0) connector that is occupied by a hard drive in the default configurations. If you have only have a 'Blade' SSD installed. You can house your original factory Apple blade SSD in the Envoy Pro enclosure for June 2013 to current Macs. 
(The only upgrade path is to install a genuine Apple SSD pulled from another machine).
There are currently no supported aftermarket upgrades for the ‘blade’ SSD in the Late 2013 and onward 27-inch iMac models. 
The 27-Inch "Late 2013" as well as the "Late 2014" and "Mid-2015" Retina/5K iMac models all have the necessary connector on the motherboard to add in an additional ‘blade’ SSD, even if the system only is configured with a hard drive at the time of purchase. Your old 3.5-inch HDD can be housed in this 3.5-inch HDD enclosure. To clone your existing OS/app setup first, purchase a cloning cable or 2.5-inch HDD/SDD enclosure to connect your new SSD to your mac, then use the Super Duper app to perform the clone, then switch the drives. Plus, you’ll need to add in the OWC Adaptadrive 3.5-inch to 2.5-inch drive converter. To upgrade the factory 3.5-inch HDD to an SSD, purchase any 2.5-inch SSD along with the same Hard Drive Upgrade kit. If you have a ‘Fusion drive’ setup, then you’ll need to split the fusion drive first and then perform the clone operation before upgrading the HDD. The enclosure can also house your old HDD. To clone your existing OS/app setup first, purchase an external 3.5-inch HDD enclosure or dock and put your new HDD in it, then use the Super Duper app to perform the clone, then switch the drives. To upgrade the existing HDD, purchase a larger 3.5-inch HDD along with the Hard Drive Upgrade kit. 
At the time of purchase, Apple offered a 1 TB or 3TB "Fusion Drive" (which combines a 128GB ‘blade’ SSD and a 1TB/3TB hard drive), or a stand-alone 256GB/512GB/1TB blade SSD.
The iMac 27-inch Late 2013 models have a 1TB 3.5-inch factory HDD with a 6 Gb/s SATA port. 
Follow this guide to install the RAM modules. To install the RAM, you'll need a Spudger.
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