On the Dell XPS 16 There are only 2 different processor options listed.

Intel® Core™ i7-720QM Quad Core Processor 1.6GHz (2.8GHz Turbo Mode, 6MB Cache) [Included in Price]
Intel® Core™ i7-820QM Quad Core Processor 1.73GHz (3.06GHz Turbo Mode, 8MB Cache) [Add $350.00 $300.00]

Looking at the system requirements for the software I previously selected. All of the options listed above will meet the need for processor speed.

I chose the Intel Core i7-720QM Quad Core Processor 1.6GHz (2.8GHz turbo mode, 6MB Cache). I think the Core 2 Duo T6600 is a better choice right now. The additional cache memory should allow for the computer to run faster and operate more smoothly.