Chapter 2: Powering The System - Dell OptiPlex 3090 Ultra Setup And Specifications

This system can be powered using a 65 W adapter (4.5 mm input power source) or through the USB Type-C cable connected
to a display capable of providing power delivery of 65 W or greater. During normal operation, when the device is connected
with a single power source (primary power source), connecting a second power source and disconnecting the primary power
source will shut down the device. However, if the secondary power source is disconnected while the primary power source is
connected, the system continues to operate normally.
When the device is powered with both the power sources—AC adapter and USB Type-C cable, the AC adapter is the primary
power source and USB Type-C is the secondary power source. Disconnecting the AC adapter will shut down the system. If the
secondary power source is disconnected, the system continues to operate normally.
NOTE: Hotswap between the AC adapter and USB Type-C power source is not supported.
Table 1. Powering the system
Primary Power Source
AC Adapter
AC Adapter
Rear Type-C
Rear Type-C
14 Powering the system
Secondary power source
connected
Rear Type-C
Rear Type-C
AC Adapter
AC Adapter
Powering the system
Power source disconnected
AC Adapter
Rear Type-C
AC Adapter
Rear Type-C
2
Operation
Shut down
Normal operation
Normal operation
Shut down