These look very interesting indeed...
Precision M4700 Mobile Workstation Details | Dell
Precision M6700 Mobile Workstation Details | Dell
/edit
If I'm reading it right, looks like it's only powered on the 6700?
Precision M4700 Mobile Workstation Details | Dell
Precision M6700 Mobile Workstation Details | Dell
/edit
If I'm reading it right, looks like it's only powered on the 6700?