“I currently have the 2019 iMac 21.5 in screen with 8GB, so is it compatible because I want to upgrade to 32G?”
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PC4-21333 Unbuffered Nonparity 260-pin 2666MHz DDR4 SDRAM
I would recommend:
Sorry, there was a problem. Please try again later.No! You need DDR4-2666 or DDR4 PC4-21300 • CL=19 • Dual Ranked • x8 based • Unbuffered • NON-ECC • DDR4-2666 • 1.2V • 2048Meg x
Sorry, there was a problem. Please try again later.For the 21.5-Inch "2019" iMac models, Apple reports that they have 8 GB of "2400 MHz DDR4" or "26666 MHz DDR4" memory "built into the computer" and "it can only be upgraded by an Apple Authorized Service Provider if you choose to upgrade at a later date." If you tinker watch a YouTube tear-down video but this voids warranty on the system. Unlike PCs Apple does not support the computer building aspect/hobby. They are considered proprietary systems with incredibly limited customer after-purchase customization.
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