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When is it available on new iMac?
iMac
None of the new Mac's support Target Display Mode.
carefully read > Use your iMac as a display with target display mode - Apple Support
None of the new Mac's support Target Display Mode.
carefully read > Use your iMac as a display with target display mode - Apple Support
And it won't ever be available. It is clear that Apple is dropping support for TDM - in fact I would bet that there is no hardware support either, so more is required than just an OS upgrade.
target display mode
