Can i install this ram card for my 2019 imac 27inch

Unless that memory shipped with a Mac from the factory, then it is unlikely the memory is compatible. I don't see any Apple identifier marks on that memory module.

Macs are very picky about the memory they use. The only memory that is known to be fully compatible is from OWC since Crucial is no longer selling memory for Macs.

Let me reiterate my previous reply and please read it very carefully!!!!!

There is more to memory compatibility than the the speed listed on the memory module or the information provided by Apple on the products' technical specifications. Memory has a lot more timings that must also be compatible....timings which most memory vendors only provide on a data sheet.....and Apple has never provided those other compatible memory timings.

If you install any of the memory you pictured into the Mac, then perhaps it may work or will seem to work. Incompatible memory will show up as odd issues at odd times. It will likely make your system unstable and may even corrupt your data and file system. Do you really want to risk it?

And please answer the question I asked in my previous post........why do you want to upgrade the memory in this iMac now after all these years? If it is to address performance issues, then most likely more memory is not going to help. I noted the most common reasons for performance issues in my previous post. Plus there is a very simple method for determining if you need more memory for your workloads.

I would suggest buying RAM only from Other World Computing.

Other World Computing – OWC Memory Upgrades For 27" iMac with Retina 5K Display (2019 - 2020)

OWC and Crucial used to be the two "go to" vendors for RAM guaranteed to be compatible with Macs, but these days, Crucial seems to have gotten out of that business.

I would suggest not scrounging up parts from random places. First, you showed us a picture of a 16 GB part that isn't compatible, next you showed us an 8 GB part that isn't compatible.

This is a waste of our time and yours.

If it's not worth $38 for the cheapest OWC option (a 16 GB kit consisting of two compatible 8 GB modules), then it's not worth spending any further time on this project. Just use the iMac with the RAM that it has now.

hansaka17 wrote:

How about this

https://discussions.apple.com/content/attachment/4cdc5d89-ebda-48ee-9ba9-569d4309911a

It is your computer, do with it as you wish. You've already been given all the information needed, but it seems you want to ignore it for some magic beans. @John Galt's most recent post says things very well which I will quote again here because it is very important and very clear:

John Galt wrote:

Plug it in. It will either fit, or it won't. If it fits, it will either work, or it won't. Or (most likely) your iMac will crash immediately upon startup, randomly after a period of operation, or at some time in the near or distant future.

Macs are intolerant of RAM that does not meet Apple's stringent specifications. The only aftermarket RAM that I have used and would ever recommend is sold in the United States by OWC / MacSales. Anything else is almost certain to be unreliable.

No. That module is for laptops.

dialabrain wrote:

No. That is also for laptops.

FYI, iMac's use SO-DIMMs like the older laptops or some Windows based laptops.

Plug it in. It will either fit, or it won't. If it fits, it will either work, or it won't. Or (most likely) your iMac will crash immediately upon startup, randomly after a period of operation, or at some time in the near or distant future.

Macs are intolerant of RAM that does not meet Apple's stringent specifications. The only aftermarket RAM that I have used and would ever recommend is sold in the United States by OWC / MacSales. Anything else is almost certain to be unreliable.

Doubtful since the sticker does not say "Mac Compatible" or "For Mac".

To double down on this....if you have to ask, then it is also 99% likely a NO.

I cannot find any information on that memory module since it is so old, plus Crucial no longer sells any memory for Apple devices.

There is more to memory compatibility than the the speed listed on the memory module or the information provided by Apple on the products' technical specifications. Memory has a lot more timings that must also be compatible....timings which most memory vendors only provide on a data sheet.....and Apple has never provided those other compatible memory timings.

Follow @Servant of Cats' advice if you feel it is worthwhile spending money on that system.

Just curious why you think you need to upgrade the memory now after all these years? If this iMac has performance issues, then more than likely those performance issues are due to one of the following unless you have suddenly changed how you use this Mac:

1. Failing Hard Drive
2. Issue with third party installed software
3. Hardware issue with the Logic Board

We can help with performance issues. Run the third party app EtreCheck and post the complete report here so we can examine it for clues.

How to use the Add Text Feature When Posting an EtreCheck Report - Apple Community

No. That is also for laptops.

I would also caution you about using RAM not sold for your specific Mac model -- on a 2019 iMacs, if it is the correct spec, you could install and test it, but not worth any risk imho unless you are a gambler -- OWC is my RAM vendor although their prices have recently shot up, and so far Apple doesn't appear to have disabled 3rd party Ram with their software updates

original "Apple" ram in 2019 iMacs looks like this (21.5" 4K model) -- though it may change by what they have available:

it reports like this in System Profiler:

2019 does not require ECC feature so it always reports disabled in profiler

[Edited by Moderator]