Dual displays is weird. For instance I have a GeForce 3 64MB that came with my DA back in the day, it has SVGA and ADC outs but will only drive one at a time. As alk mentioned though, the Radeon 9000 ME runs dual monitors just fine with the same 64MB RAM.

iirc the GeForce 3 is a superior card to the 9000, which was basically a crippled 8500 running at a higher clock speed, yet it will not push two displays at once. Dunno.