Het volk van Digital Web 3D kreeg een interessant mailtje van Matrox, over AGP4x support in de G400. Het blijkt dat de G400 in principe al vanaf het begin met AGP 4x overweg kon, maar dat support van de AGP 4x mode pas sinds de nieuwere '4A' revisies gegarandeerd wordt:
When we launched G400 in May 1999, 4x motherboards did not exist. Although our part was able to work in 4x transfer mode we felt that before the Camino chip set was launched, it would be unfair to our customers to guarantee 4x operation since there are many factors that influence operation speed that are out of our control. Matrox did however ensure 4x compatibility which means that all Matrox G400 graphics boards will work seamlessly in 2x or 4x systems. Since Camino has launched, we have been able to extensively test our boards with AGP 4x. We've identified the G400 boards that support AGP 4x transfer rates with an additional '4A' in the part number: G4+MDH4A32GB/40.