The Display and, almost certainly the Card, is fixed at approx. 6XX x 8XX and it might be 16" resolution rotated, dunno, my APD adapter's down ATM and vixing it is way down on the hackSheet.

You can get the card to drive a multisync monitor at that res if you noodle out the connections and "roll your own" adapter/cable. All the info's out there in the DevNotes and by googling 13w3.