What does the HP high quality chassis on HP Z420 workstations make easier than doing the same
task on the Fujitsu Celsius M730 workstations?

A.
Connect USB devices

B.
Run security scans

C.
Turn power on and off

D.
Upgrade without tools

Explanation:
The HP Z420 gives you professional expandability in an accessible, tool-free minitower form factor

http://www8.hp.com/us/en/campaigns/workstations/z420.html