What are the differences between Portable Penetrator PP3000, PP6000 and PP7000?

What are the differences in hardware between model PP3000, PP6000 and PP7000?

The difference between the performance of these models?
 

PP3000 is based on a netbook to be very affordable and can deliver around 250 Cracks per second.

PP6000 comes on a powerfully high end laptop and can deliver 1.600-1.700 Cracks per second when cracking wifi WPA and WPA2 networks.

PP7000 comes on a Military grade rugged Laptop. It can deliver around 1400 cracks per second when cracking wifi WPA and WPA2 networks.