According tomedia reports, according to the 2020 dismantling of the new 27-inch iMac, Apple has made some internal changes to accommodate the removal of the mechanical hard drive, including the removal of the SATA connector, the integration of the SSD into the logic board, and minor changes to the housing. Apple this week updated the 27-inch iMac with some configuration upgrades, but kept the physical design intact. In the regular removal of the new model, it appears that most of the changes were made on the logic board.
In the new model, Apple eliminated the option for users to upgrade storage themselves, as confirmed by the OWC Disassembly video. Removing the iMac’s screen is similar to earlier models, just because the camera is now part of the screen component, so you need to disconnect the extra wires.
Once turned on, the interior looks very similar to earlier models, with two main exceptions, including an attached microphone to the case and no hard drive. The inspection of the logic board further proves that the removed model does not have user-upgraded storage space because there are no SATA connectors on the board at all.
It is understood that the 4TB and 8TB flash versions will have a flash expansion board connected to the logic board via a special connector, while for the lower capacity version, the flash memory is integrated in the middle of the board, so there is no chance to safely remove it.
Removing the heat sink reveals that Apple has selected a socket processor over a welded version, which may result in future upgrade options. The memory has also been inserted into the slot and can be completely serviced by the user.