16GB ( 1x16GB ) Apple Geniune Hynix DDR4 2666 MHz Non-Parity/Non-ECC Unbuffered SODIMM Memory 260 pin Dual Rank Module. Memory Upgrade Compatible with 2020 27 inch iMac w/ Retina 5K Display model ID: 20,1 20,2 (i5 3.1GHz, i5 3.3GHz, i7 3.8GHz, i9 3.6GHz). Models: MXWT2LL/A, MXWU2LL/A, MXWV2LL/A Memory Upgrade Compatible with Early 2019 27 inch iMac w/ Retina 5K Display model ID: 19,1 (i5 3.0GHz, i5 3.1GHz, i5 3.7GHz, i9 3.6GHz). Models: MRQY2LL/A, MRR02LL/A, MRR12LL/A Memory Upgrade Compatible with Late 2018 Mac Mini model ID: Macmini 8,1 (i3 3.6GHz, i5 3.0GHz, i7 3.2GHz). Models: MRTR2LL/A, MRTT2LL/A Every module is backed by a limited lifetime warranty. We always have hundreds in stock! Every single module is fully tested by the manufacturer. Our experienced technicians can verify if these parts will work for you with free technical support. Want to make sure this module works for your device? We offer free technical support from our own certified technicians. Memory modules by Adamanta comes with Limited Lifetime Warranty so you know you will have the support for your investment. Don't trust just any memory module out there. Every single piece sold are stress tested for reliability and longevity.