Lenovo System x3950 X6, Planning Manual

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Power Supply Installation and Ordering
The following rules apply when installing 1, 2, and 4 AC and DC PSUs in the x3850 X6
system.

For a 1 PSU installation, install the PSU in bay 3. Fillers must be installed in
bays 1, 2, and 4.

For a 2 PSU installation, install the PSU in bay 2 and 3. Fillers must be installed
in bays 1 and 4. Ensure both PSUs are of the same wattage (both 900W or
both 1400W only). Install each supply on separate power feeds for power
redundancy.
 For a 4 PSU installation, install the PSUs in all bays.

The 750W DC power supply requires all 4 PSUs to be installed together.
 Due to the smaller size of the 900W and 750W PSUs a mechanical filler is
installed in the bay along with the PSU.

Mixing of AC and DC power supplies is not supported.
The suggested power installation order for a x3850 X6 is as follows:
 PS Bay 3 – 1 st power supply to be installed
 PS Bay 2 – 2 nd power supply to be installed

PS Bay 1 – 3 rd power supply to be installed
 PS Bay 4 – 4 th power supply to be installed
Note: 1, 2 or 4 PSU configurations are supported. 3 PSU configurations are not
supported.
The suggested power installation order for a x3950 X6 is as follows:

PS Bay 3 – 1 st power supply to be installed
 PS Bay 2 – 2 nd power supply to be installed
 PS Bay 7 – 3 rd power supply to be installed

PS Bay 6 – 4 th power supply to be installed
 PS Bay 1 – 5 th power supply to be installed

PS Bay 4 – 6 th power supply to be installed
 PS Bay 5 – 7 th power supply to be installed
 PS Bay 8 – 8 th power supply to be installed
Note: 4 or 8 PSU configurations are supported. All other combinations (1, 2, 3, 5, 6,
and 7) are not supported.
Use the System x Power Configurator tool to calculate your total power draw and
assist you in determining the type and number of PSUs required.
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