Power, Thermal, Acoustic; Power Supplies And Power Subsystem; Figure 4. Power Supply - Dell PowerEdge R910 Technical Manual

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5 Power, Thermal, Acoustic

The Dell™ PowerEdge™ R910 achieves enhanced power efficiency by implementing the following
features:

User-selectable power cap (subsystems will throttle to maintain the specified power cap)

Improved power budgeting

Larger heat-sinks for processors and IOH

Accurate inlet temperature

Power supply and voltage regulator (VR) efficiency improvements

Switching regulators instead of linear regulators

Closed loop thermal throttling

Increased back venting and 3D venting

PWM fans with an increased number of fan zones and configuration-dependent fan speeds

Use of DDR3 memory (lower voltage than DDR2)

Processor VR dynamic phase shedding

Memory VR static phase shedding

Random time interval for system start

Allows an entire rack to power on without exceeding the available power

BIOS Power/Performance options page

BIOS-based CPU P-state manager (power management in a virtualized environment)

Ability to slow down or throttle memory

Ability to disable a processor core

Ability to turn off items not being used (USB ports, embedded NICs, unused PCIe lanes)

Option to run PCIe at Gen1 speeds instead of Gen2

5.1 Power Supplies and Power Subsystem

PowerEdge R910 supports two types of power supply units:

1100W high-output

750W Energy Smart
The power supply bay is designed to prevent unsupported power supplies from being installed. Mixing
of 1100W and 750W power supplies is not supported. R910 power supplies have embedded cooling
fans and one bi-colored status LED.
The PowerEdge R910 power supplies have a FRU EEPROM; FRU data is stored in the memory of the
power supply microcontroller. iDRAC can update the power supply firmware over the PMBus. Power is
"soft-switched," allowing power cycling using a switch on the front of the system enclosure or
Dell PowerEdge R910 Technical Guide
Power Supply
Figure 4.
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