Banchetto 101 Case-Less System
eVGA 780i Mobo
eVGA 295 GTX Video
8 Gb Corsair Memory
Thermaltake TRUE Black CPU Cooler
VelociRaptor 10,000 rpm HD
Windows 7 RC 7100
XPS models are better and faster and more expandable. You would have to site SPECIFIC models for any further information.
There is no one size fits all answer for the entire line of Inspiron vs XPS models.
XPS9000 460w supports 150W video card INSPIRON 3847 must have 305W power supply updated.
XPS9000 has 6 ram slots Inspiron 3847 has 2 ram slots.
as an example.
The current XPS model is the 8900.
Max Ram in Inspiron 3847 is 16 gigs.
Max Ram in XPS models is 24 gigs or more.