Dell PowerEdge R720 Technical Manual page 8

Key technologies Detailed descriptions
DC power supply A new 1100W DC power supply option is available for the R720 and R720xd.
The internal dual SD module enables Dell's unique Failsafe Virtualization architecture,
Failsafe hypervisors ensuring uptime by providing failover capability for embedded hypervisors, such as
VMware
Dell has tested and validated an integrated data center solution that enables you to
Fresh Air cooling operate at higher temperatures or even chiller-less. See the Power, thermal, and
acoustics section for details.
PowerEdge R720 and R720xd Technical Guide
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vSphere ESXi™.