2009 iMac 24: MXM slot or not?

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Cincoze's rugged “GM-1000” embedded PC combines an 8th or 9th Gen Coffee Lake CPU with an MXM socket plus 2x SATA trays, triple display

Any laptop with a MXM slot Such laptops are manufactured by: 1)Clevo 2)MSI(GT 72 series and GT 80 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

slot deposit 5rb MXM slot present on the laptop's motherboard The MXM specification defines three primary form factors: MXM-A, MXM-B, and MXM-III These form factors vary Graphics: NVIDIA GeForce 9400M Chipset Integrated MXM OpenCL Supported iMac 20 Aluminum