Ultra Start 450 SERIES Instruction Manual download pdf (Page 102)

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101

82 Ultra Enterprise 450 Server Owner’s Guide • July 1997

How to Determine System Power

Requirements

Before You Begin

You must perform the following tasks:

■ Review information about power budgets; see “About Power Budget Constraints”

on page 79.

■ Review information about power supply redundancy; see “About Power

Supplies” on page 64.

After you have reviewed the sections listed above, you can use the “System Power

Requirements Worksheet” on page 86 and the procedure provided in this section

to determine the following power requirements of your system configuration:

■ DC amps at +3.3 V, +5 V, and +12 V

■ Total DC watts

■ Total AC amps

The worksheet divides the Sun options available for your system into the following

categories: base systems, CPU options, memory options, internal peripheral options,

PCI cards, graphics options, and miscellaneous options. It also provides a section at

the end for third-party options. Blank lines have been left at the end of each section

so that you can add new options when they become available.

The worksheet lists the current draw of each item at +3.3 V, +5 V, and +12 V, where

possible. In some cases, the power specifications can only be obtained from the

information that is shipped with the product.

This section also includes sample configurations and their calculations as well as

information on what to do if your system exceeds power budget constraints.

How to Calculate Your DC Power Requirements

This procedure presumes that you know the DC current draw on each power supply

output for each system option. In some cases, the documentation that is supplied

with the option may only provide the total watts required for the option. In this case,

you should calculate the +3.3 V and +5 V total (Step 8 in the following procedure)

with the information you have available. The number you obtain will not be

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