OWC / Other World Computing 64GB DDR4 SO-DIMM Upgrade Kit (4x16GB) — PC4-21300 2666MHz CL19 204-pin & PC19200 2400MHz 260-pin, 1.2V

OWC 64.0GB memory upgrade kit featuring four 16GB DDR4 SO-DIMM modules. The set consists of Four 16GB DDR4 2666MHz PC4-21300 CL19 SO-DIMMs, 1.2V, 204-pin with Mac-qualified Thermal Sensor EEPROM, and also references PC19200 DDR4 2400MHz SO-DIMM memory, 260-pin, 1.2 Volts. Modules are non-registered, non-ECC and fully compliant with JEDEC standards. Key specifications: Four 16GB DDR4 modules; PC4-21300 (2666MHz) CL19 SO-DIMM, 204-pin, 1.2V with Mac Thermal Sensor EEPROM; PC19200 (2400MHz) DDR4 SO-DIMM, 260-pin, 1.2 Volts. Non-registered, Non-ECC, JEDEC compatible. Model compatibility: Compatible with 2017 iMac models — iMac with Retina 5K display (27 inch, mid 2017). Model ID: iMac18,3 (supports 3.4GHz & 3.5GHz & 3.8GHz Core i5 & 4.2GHz Core i7). Also compatible with: PC laptops, PC notebooks, All-in-One computers, NAS devices (including Synology), and POS systems. Compatible part numbers: CT16G4S24AM, CT2K16G4S24AM, KCP424SD8/16, KVR24S17D8/16, MP7N2G/A, HMA82GS7CJR8N‑UH, M471A2K43CB1-CRC, M471A2K43DB1-CRC, M471A2K43BB1‑CRC, CT16G4S24A, CT2K16G4S24A. Performance note: Upgrading memory is one of the simplest and most effective ways to improve performance in your Mac Pro.