Which option available on HP Z420 workstations enables whisper quiet acoustics even under
heavy loads?

A.
Mini tower design

B.
Up to 64 GB ECC memory

C.
Latest technology from NVIDIA

D.
Liquid cooling subsystem

Explanation:
http://www.asetek.com/press-room/news/2009/asetek-adds-liquid-cooling-to-hp-zworkstations.aspx