NVIDIA GeForce 9800 GX2 graphics and say it loud, boy. Just not too loud, you don't want to step on the toes of your Alienware subsidiary.
Update: Mystery solved. Looks like Dell dropped the "i" from the XPS 630i which we had the chance to get up close to at CES. It's just an mid-level gaming rig. Nothing to see here folks, move along now.
[Thanks, Thomas C.]