Power Supply Units; Hot Spare Feature - Dell PowerEdge R330 Owner's Manual

Figure 77. Installing the heat sink
1. retention screw (4)
3. processor socket
Next steps
1. Follow the procedure listed in the After working inside your system section.
2. While booting, press F2 to enter System Setup and verify that the processor information matches the new system
configuration.
3. Run the system diagnostics to verify that the new processor operates correctly.

Power supply units

Your system supports 350 W AC redundant power supply units (PSUs).
NOTE: If two PSUs are used, they must be of the same type and have the same maximum output power.
When two identical PSUs are installed, the PSU configuration is redundant (1 + 1). In redundant mode, power is supplied to the
system equally from both PSUs to maximize efficiency.
When only one PSU is installed, the PSU configuration is non-redundant (1 + 0). Power is supplied to the system only by the single
PSU.
In a non-redundant configuration, install a PSU blank in the empty PSU slot.

Hot spare feature

Your system supports the hot spare feature that significantly reduces the power overhead associated with power supply unit (PSU)
redundancy.
When the hot spare feature is enabled, one of the redundant PSUs is switched to the sleep state. The active PSU supports 100
percent of the load, thus operating at higher efficiency. The PSU in the sleep state monitors output voltage of the active PSU. If the
output voltage of the active PSU drops, the PSU in the sleep state returns to an active output state.
If having both PSUs active is more efficient than having one PSU in the sleep state, the active PSU can also activate the sleeping
PSU.
The default PSU settings are as follows:
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2. heat sink
4. retention screw slot (4)