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MXINFO only reads the BIOS PINS structure (if I'm not mistaken). Windows identifies cards via the PCI configuration registers, not the BIOS. You'd think they'd be the same, but the latter can, e.g., be strapped and have no relationship to the former.
If you check Matrox's own inf files in their driver packs, 0x217D is reserved for the "G400 DualHead Max", while 0x2179 is reserved to the "G400 DualHead".
Put another way, 0x217D is how Matrox identifies the Max as a Max to Windows.
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