RAM Compatibility (2017 iMac)

Crucial or OWC are good, nothing else that I have experience of is.

Hereis a link to OWC 16gb chips. [Sponsored]OWC 16GB 2400MHZ DDR4 SO-DIMM PC4-19200 Memory Upgrade For 2017 iMac 27 inch with Retina 5K display

One takes any speed RAM up to 2666, the other up to 2400 Mhz. But Corsair RAM is not recommended at any speed. Buy OWC or Crucial RAM.

The first two links are 288 pin.

Follow the links from Csound1 for compatible RAM.

Buy OWC Ram from OWC

And the link I previously posted is for 16GB chips by OWC on sale at Amazon. Did you even click it?

I had no idea Corsair had a bad reputation. I just looked at that after seeing a known Mac fansite upgrade using that.

Corsair and Kingston appear to share the same issue: they have two tiers of RAM based on quality and therefore price. As a rule the higher-priced version from either company works in Macs but is terribly hard to find or even assure yourself what is being offered is the top-tier version. Because the RAM market is so price-sensitive, few resellers stock more that just the cheaper, not-happy-in-Macs versions.

You often have to order their premium RAM directly from the manufacturer at a price that can cost as much or more than OWC or Crucial. I avoid problems by using only OWC RAM for all our Macs plus those I support for others for well over a decade and it works without issue every time. I need look no further.

I agree 100% with the others. You should only buy RAM directly from OWC or Crucial and use the Amazon Gift Cards to buy a good external backup drive or something else.

I was about to steal from Ralph Nader, "unsafe at any speed"

Ah yes, the Corvair of the RAM world. 😝

I am glad that you found it helpful.

That is not what I said. If you want a 16 G increase buy a pair of 8's.