Can I install SSD in a 2019 iMac?

Those 27" iMac's came with a Fusion Drive (a small SSD and a HDD) or they could be configured with an SSD.

see > iMac (Retina 5K, 27-inch, 2019) - Technical Specifications - Apple Support

You will need to call and check with your local AASP to see if they do SSD upgrades on that year model.

see > https://getsupport.apple.com/repair-locations?locale=en_US

Instead of paying for an expensive internal upgrade, you can startup and run from an external SSD.

see > Use an external SSD as your startup disk … - Apple Community

If the internal drive is not actually failing and throwing errors, you will have no problem finding fast, compatible external ones.

Your Mac’s USB-C / Thunderbolt ports can support USB 3.1 Gen 2 / NVMe SSDs, or even faster Thunderbolt 3 ones. Any of its USB-A or USB-C ports would be fast enough for slower USB 3 / SATA SSDs. (Even those might well be faster, overall, than a Fusion Drive.)

The question is not whether you can get good external drives but whether your current issues are ones that an external SSD could address.

Why not use a TB drive connected to one of your TB ports. The other USB ports are 5gb/s and too slow. However, if you want to save cost then use an NVME drive like a WD Black series in a USB 3.2 gen 2 case. You can also get one all ready to go like this one:

https://www.amazon.com/dp/B0BN4J1994/?coliid=I26AUQ3QFF4ZLY&colid=16WHQQ1HVMSYP&ref_=list_c_wl_lv_ov_lig_dp_it&th=1

In a very short time (this fall) Apple will be releasing the next version of Mac OS V26 known as Tahoe. That version will only run on 2020 and later iMacs. What that means to you is your machine has reached the end of the road and spending money on it is like throwing money into a burning fire, a total waste.

If the machine is okay, continue using it until it no longer works or for another 2-3 years and then retire it but don’t spend a nickel upgrading hardware on it.

However if you must get a SSD, follow den.theds advice and get yourself an external SSD. Also, ' No Apple will not do aSSD upgrade for you.

I use an eternal clone of my 2019 27" iMac which consists of an NVME drive in a thunderbolt enclosure. Works great, no issues for all programs.

kindjohn wrote:

 Thank you for that info.

You're welcome.

My computer can’t handle Logic Pro and Final Cut which I use everyday.

Do you think it will with a good external ssd hard drive running the osx and everything ?

or do you need to know more about the computer to know this.

sometimes my computer will run well for a short while and then go slow and stay slow,

so its probably the old 6 year old Fusion Drive and nothing else right.

If you can advise on the above question it would be much appreciated.

EtreCheckPro is an excellent tool for finding weaknesses and sorting out other problems.

Download and run the free version of EtreCheckPro, from > https://etrecheck.com/en/index.html

Then post back here with your Report, as per > How to use the Add Text Feature When Post… - Apple Community

You should seriously consider upgrading to a new Silicon Mac. The best and most economical model is the Mac Mini M4. A 10 Core Mac Mini M4 with 15 GB RAM and 1 TB SSD with a 32" LG 4k monitor w/speakers is $1418 w/tax which is $650 less than a similarly configured new 24" iMac.

Just some food for thought.

how much system memory?

because if it's short of system memory then having faster storage may not be enough