While the layout remains the same, the internal architecture has changed on the 21-inch iMac Late 2013 model from the previous version. The PCI bus for an SSD card is now present on the base model where it was not even included in the last model. So there’s hope for adding an SSD to models that did not originally come with one.
Update: 27″ iMac teardown photos have now been added to the gallery.
As always, follow the OWC Blog for industry coverage, tips, and more tricks for keeping your Apple products at their best.