If it's just plain DVI-D, that implies it's a single-link; they'd likely have mentioned if it was dual-link. Single-link DVI-D supports only up to 1920x1200 as mcnumpty23 said. Dual-link DVI would support up to 2560x1600.
Assuming your 30" monitor is like most other 30" monitors, its native resolution is 2560x1600. That means that no, your display adapter would not be sufficient for the best image quality. It's not really a shortcoming of the HD 3000 GPU, just of the adapter plug.