The best way to do what you want is to use a DH2G Digital (or TH2G) at 3200x1200 (2x1600x1200). The take each output and run it through an image pro to down convert from 1600x1200 to 1400x1050.

Something else you can try is to use a Mac Pro with an X1900XT in it. In many of the observations, the X1900 seemed to match outputs better in a blend.