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I purchased this OWC 2 X 4GB memory upgrade on amazon three weeks ago (see picture), as it is not available in Singapore yet. It works on iMac 27, late 2017, 5k. I have been using it for less than a week. It works perfectly and has lifetime warranty. I am selling it because I need extra speed and planning to replace it by 2 slots of 8 GB.
Brand New HP Laptop Bag 15.6"