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EPS2U Power Supply Design Guide, V2.1
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Purpose
This 2U Rack Power Supply Specification defines a common power supply used in entry-level servers. This
supply may range typically from 400 to 700 watts and is used in a non-redundant configuration. The scope of this
document defines the requirements for one supply in this power range. The parameters of this supply are defined
in this specification for open industry use.
This specification defines 480W, 550W, 600W, and 650W power supplies with multiple outputs; 3.3 V, 5 V, 12V, -
12 V, and 5 VSB. Because of its connector leads, the power supply is not intended to be a hot swap type of
power supply.
Conceptual Overview
In the Entry server market, the bulk power system must source power on several output rails.
These rails are typically as follows:
• +3.3 V
• +5 V
• +12 V
• –12 V
• 5 V standby
NOTE
Local DC-DC converters shall be utilized for processor power, and will ideally convert power from the +12 V
rail, however, they may also convert power from other rails.
The bulk power system may be a n+1 redundant power system or a non-redundant power system.
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