They just don't seem to work very well even with the adapters. I would stay with either an original Apple stick (high dollar) or go with an OWC stick.
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They just don't seem to work very well even with the adapters. I would stay with either an original Apple stick (high dollar) or go with an OWC stick (I don't think they make one yet for this model as they only list these upgrades https://eshop.macsales.com/upgrades/imac-retina-5k-27-inch-late-2014-3.5-ghz/internal-drives).
It's also very difficult to install: [guide|30537]
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Personally I'd add just a standard SSD drive like this: https://www.ifixit.com/Guide/How+to+Add+An+SSD+To+The+27-Inch+iMac+%28Late+2015%29/67309
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Personally I'd add just a standard SSD drive like this: [guide|67309]