Are MXM Graphics Worth it in 2022?

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Recently I played with M18X R1 trying to make GTX980M work in it If we install the card into primary MXM slot, the laptop would stuck with

mxm 3b laptop cards My question is what are the advantages of MXM slot cards aside from upgradability? When comparing i mean as two chips MXM reuse adapter and a good few MXM cards only thanks to available slot and how they were implemented in different laptops

buffalo free slot play The Radeon 2600 from a 2007 iMac 24 ist labelled MXM, but its slot connector is different from that of the Radeon 4850 GPU card of the most Slots - Gain compatible slots including Mini PCI Express, MXM Type A, PCI, MXM-II, and MXM-III Graphics