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3.5 Power considerations
The x455 ships with two redundant, hot-swappable power supplies that produce
1050 W each at 220 V, or 550 W each at 110 V. When the x455 is populated with
more than two processors, memory, and adapters, the power supplies may not
be redundant if they are connected to a 110 V power source. Therefore, IBM
recommends that the x455 be connected to a 220 V power source to ensure
power supply redundancy for large configurations.
Tip: If power is not redundant, the non-redundant LED will be lit in the Light
Path Diagnostic panel (see "Light path diagnostics" on page 27).
Two system power-cord connectors are available on the back of the x455, one for
each of the power supplies. Connect each of these power connectors to separate
power circuits to ensure availability if one circuit should fail.
The x455 ships with two 2.8 m/9 ft IEC 320-C13 to IEC 320-C14 power cables for
intra-rack power distribution. Models shipped in the US also include two 2.8 m/9
ft. IEC 320-C13 to NEMA 6-15P power cords for attachment to high-voltage
power sources.
3.6 Operating system support
In line with the overall message of providing application flexibility to meet the
varying needs of our enterprise customers, the x455 is optimized for the
operating systems listed in Table 3-9 on page 88.
87
Chapter 3. Planning
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