iMac 2019 3.0 GHz - To much ram?

@ant3 This is a bit confusing! Apple sells systems in set configs 16 or 32 GB of RAM. But! Thats not the systems limit!

The systems limit is 64 GB (4 x 16GB DIMMs) as seen here in this Apple RAM guide for this system

thanks for clarifying,

I just bought a BTO iMac 27 i5/3.0 6C 8GB 512GB 570X and wrongly assumed that the limits for CPU,MEM, STORAGE and Graphics were specified on the Technical Specification. Can I assume CPU,MEM,STORAGE and Graphics are all upgradable in this system to a MAX condition of

3.6Ghz 8-core Intel Core i9 CPU

64GB

2TB SSD

Radeon Pro Vega 48 with 8GB of HBM2 memory

@ant3 - Sadly, you can only upgrade the RAM and drive storage NVMe/PCIe blade as well as the 3.5" SATA drive.

While it's possible to upgrade the CPU to a i7 the i9 does use a different logic board and people have had issues upgrading to an i9, it's also very hard to do! Quite a few people have damaged their logic boards and/or the CPU chip. I would advise you don't upgrade it.

Besides, I think you'll find getting a larger blade SSD will get you much more bang for the buck!

If you just got it does it make sense returning it and getting a different model which has the better GPU and the i9 CPU. Then get the least RAM (upgrading it your self) as well as the largest blade SSD so you then don't need to pull the logic board, adding your own SATA HDD.

Well, I just returned a iMac 27 2020 i5/3.1 6C 8GB 256GB 5300

because I later learned that the 256GB SSD cannot be upgraded .

I also found that when connecting the iMac mid 2011 to the 2020 iMac,

Target Display Mode is NOT supported.

I confirmed the mid-2011 iMac when connected to 2019 iMac works in Target Display Mode.

I am trying to plan ahead and be aware of the upgrade path, as these iMacs will last many years. The mid-2011 is still working 9 years and running, although I have made a number of upgrades.

Yes, I just bought two used early 2011 Macs (iMac 27" + Mac mini) and also have a couple 17" early 2011 MacBook Pro's (need them to run Snow Leopard in order to run my legacy business app requiring Rosetta). Did not realize target mode no longer works via Thunderbolt with the 2020 iMacs so should stick with the early 2019 iMac I bought ten months ago, but new.

I want to upgrade the 21.5" 2019 iMac from 8 GB RAM to 32 GB preferably, but it will cost at least $300 total for RAM + installation (21.5" are very difficult to upgrade RAM and require removing glass and breaking the seal). Not sure if worth it or if I should buy a used 27" iMac 2019, and either get low RAM and upgrade it myself, or just buy it with at the very least 16GB RAM.