Owners Manual

Steps
1. Locate the USB port or USB memory key on the system board.
To locate the USB port, see the internal USB memory key details section.
2. If installed, remove the USB memory key from the USB port.
3. Insert the replacement USB memory key into the USB port.
Next steps
1. Follow the procedure listed in After working inside your system.
2. While booting, press F2 to enter System Setup and verify that the system detects the USB memory key.
Power supply units
Power supply unit details
Your system supports one of the following:
● Two 2400 W, 2000 W, 1600 W, 1100 W, 750 W, or 495 W AC PSUs
● Two 1100 W DC PSUs
● Two 1100 W or 750 W Mixed Mode HVDC PSUs
NOTE: For more information, see the www.dell.com/poweredgemanuals section.
CAUTION: If two PSUs are installed, both the PSUs must have the same type of label. For example,
Extended Power Performance (EPP) label. Mixing PSUs from previous generations of PowerEdge servers is
not supported, even if the PSUs have the same power rating. Mixing PSUs will result in mismatch condition or
failure to turn the system on.
NOTE: Titanium PSU is nominally rated for 200 V AC to 240 V AC input only.
NOTE: When two identical PSUs are installed, power supply redundancy (1+1 – with redundancy or 2+0 – without
redundancy) is configured in system BIOS. In redundant mode, power is supplied to the system equally from both PSUs
when Hot Spare is disabled. When Hot Spare is enabled, one of the PSUs is put into the sleep mode when system utilization
is low in order to maximize efficiency.
NOTE: If two PSUs are used, they must be of the same maximum output power.
NOTE: PSUs are hot swappable.
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 system 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:
● If the load on the active PSU is more than 50 percent of PSU rated power wattage, then the redundant PSU is switched to
the active state.
● If the load on the active PSU falls below 20 percent of PSU rated power wattage, then the redundant PSU is switched to
the sleep state.
You can configure the hot spare feature by using the iDRAC settings. For more information, see the iDRAC User’s Guide
available at www.dell.com/poweredgemanuals.
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Installing and removing system components