Matrox Millennium G550 by Ti stejne nepomohol,tam takisto ten dualhead extension nefunguje,na to treba karty matroxParhelia/fireMV/quadroNVS/matroxVIA/matroxM9 /permediaGlint3/permediaGlint4/diamondfireGL1-2-3 a podobné s podporou 3 interných videoportov v grafickom čipe....