iMac late 2012 SSD Upgrade

If your 2012 iMac has a Thunderbolt or USB 3.0 port, why not simply add an external SSD in an external Thunderbolt or USB 3.0 enclosure like the ones OWC sells?

Your iMac will still be just as fast running from a Thunderbolt or USB 3.0 connected SSD.

Why go through all this nonsense with a clearly unsupported internal SSD installation?

OWC has the quicker, easier alternatives to your issue.

Good Luck!

According to OWC, some of the 2.7 GHz iMacs (13.1) come with the PCI connector.

"The initial production of the base model for the 21.5" iMac didn't come with a slot for the SSD. Later production models included the SSD slot, but there's no way to determine if the 2012 21.5" iMac with a 2.7GHz processor has the SSD slot without opening it up to see if it's available. If you have already opened the iMac up and it does have an SSD slot, this SSD is compatible."

OWC Aura 6G

https://eshop.macsales.com/shop/ssd/owc/imac-21.5-inch/2012

Install video...

https://eshop.macsales.com/installvideos/imac_21inch_late_2012_ssd/

If I took all the time and effort to take it apart,

I would max out the memory to 16 gigs,

and put an i7-3770S processor in,

while it was open.