OWC 32.0GB UPGRADE: Consists of Two 16GB pc19200 ddr4 2400 mhz sodimms memory, 260-pin, 1.2 volts, non-registered, non-ecc, fully compliant with jedec specifications, rohs compliant, warranty safe upgrade COMPATIBLE WITH: 2017 iMac: iMac w/Retina 5K display (27 inch mid 2017) Model ID: iMac18,3 (3.4GHz & 3.5GHz & 3.8GHz Core i5 & 4.2GHz Core i7) COMPATIBLE WITH: 2017 iMac 21.5-inch: Model ID: iMac18,2 iMac w/Retina 4K display, 21.5-inch Mid 2017, (3.0GHz & 3.4GHz Core i5 & 3.6GHz Core i7); Model ID: iMac18,1 iMac Mid 2017 2.3GHz Core i5 COMPATIBLE WITH: PC Laptop, PC Notebook, All in One Computers, NAS, Synology, POS systems INCREASED PERFORMANCE: Memory Upgrades are the Most Effective and Easy Way to Boost the Performance in Your Mac Pro COMPATIBLE PART NUMBERS: CT16G4S24AM, CT2K16G4S24AM, KCP424SD8/16, KVR24S17D8/16, MP7N2G/A, HMA82GS7CJR8N‐UH, M471A2K43CB1-CRC, M471A2K43DB1-CRC, M471A2K43BB1‐CRC, CT16G4S24A, CT2K16G4S24A MP7N2G/A INDUSTRY LEADING: Consumer Friendly Advanced Replacement Program and Limited Lifetime Warranty, which Includes Free Tech Support by Other World Computing