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Ok I need to know the ram spec for this logic board.aka how much is supported and what speed .it is fully disassembled and all I get is conflicting info . I’m not interested in anything other than this machine . I have replaced the ram and hdd in my iris 2017 with zero issues
iPhone 11, iOS 17
If you are adding RAM because your iMac is slow, you could be wasting your money if it has the original mech hard drive. 95+% of slow iMac report se are traced to the drive, not the RAM. Adding RAM to an iMac with a slow HDD will make no perceptible difference.
As it's already apart, you can replace its old mech HDD with an SATA 6GB solid-state drive. The base 2.5-inch SATA 3GB 5400rpm drive in 2017 21.5-inch iMacs on its best day ever could achieve write/read speeds no faster than 80MB/sec. An SATA SSD in the main drive bay will do 500-600MB/sec.That's at least an 8X improvement.
https://eshop.macsales.com/item/OWC/K21IM12HE1TB/
NOTE: if you install an internal SSD, be sure to engage TRIMforce. I failed to do that because OWC said it was not needed, but later I found it was.
How to Execute ‘Trimforce’ Command with Your SSD
If you have the optional Fusion or SSD storage, something else is at play. A healthy Fusion system should not be perceived as slow, and the factory SSD practically screams speed.
Your Max RAM depends on whether you have the 21.5-inch 4K with a four-core processor, or the crippled 21.5-in 2017 educational/institutional model.
The 4K's max RAM is, per Apple, 32GB but with newer modules can do 64GB. The Edu-model can do 16GB per Apple but 32GB with newer modules.
The crippled version has a slow 2-core 2.3 ghz i5 compared to the minimum 3.0 ghz i5 in the 4K model. I'm not convinced that throwing any money at the Edu-model is supportable in most situations.
Check the OWC site for your options.
+1 thumbs-up for OWC
This repair requires a new logic board I purchased one with the I-7 and zero ram installed
2017 21.5 iMac Retna what ram to buy
