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Definition: MXM


(Mobile PCI EXpress Module) A standard interface for graphics processing units (GPUs) in a laptop computer. Spearheaded by NVIDIA in 2004, MXM-enabled graphics cards can be interchanged, and numerous laptop vendors support them. MXM cards that do not comply 100% with the standard are also used.

In order to bring a laptop up to desktop graphics standards, external GPUs may be used that reside in their own enclosures and connect via ExpressCard or Thunderbolt interfaces. See external GPU and PCI Express.

  MXM        Size
  Type    (Wide/Long)

   I      70 x  68mm
   II     73 x  78mm
   III    82 x 100mm
   IV     82 x 117mm (deprecated)

   A      82 x  70mm
   B      82 x 105mm