Upgrade the memory of your compatible Apple iMac or Windows laptop with the 8GB DDR4 2400 MHz SO-DIMM Memory Module from OWC. Operating at 1.2V, this 8GB memory module fits in 260-pin SO-DIMM slots and has a 2400 MHz clock speed, a PC4-19200 bus speed, and a low-noise, 8-layer PCB design.
This memory module is compatible with the mid-2017 27" Retina 5K iMac, the mid-2017 21.5" Retina 4K iMac, and the mid-2017 21.5" 1080p iMac. The memory also works with compatible Intel- and AMD-powered Windows laptops.
Installing this memory in a 2017 21.5" iMac requires tools to remove the display and adhesive to reseal it.