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PC Hardware in a Nutshell, 3rd Edition
book

PC Hardware in a Nutshell, 3rd Edition

by Robert Bruce Thompson, Barbara Fritchman Thompson
July 2003
Beginner to intermediate content levelBeginner to intermediate
874 pages
38h 13m
English
O'Reilly Media, Inc.
Content preview from PC Hardware in a Nutshell, 3rd Edition

SFX/SFX12V Power Connectors

The SFX Baseboard Connector uses the same pinouts, wire colors, and physical connectors as the ATX Main Power Supply Connector shown in Table 26-12, with one or two exceptions:

  • Pin 9 (+5VSB) is an optional signal for SFX power supplies. If present, it allows the motherboard to control the power supply, just as with ATX and NLX. If Pin 9 is not connected, the power supply must be controlled by a standard AC on/off switch.

  • Pin 18 (-5VDC) is not connected on SFX power supplies because -5VDC is required only by ISA expansion slots, which are not supported by SFX systems.

SFX12V power supplies (but not SFX power supplies) also include the ATX12V connector described previously.

The SFX specification defines the required SFX Control Connector, shown in Table 26-17. This connector uses the same physical connectors and 22 AWG wire as the ATX and NLX Optional Power Supply Connectors described in the preceding sections, but has only one connection, FanON/OFF, which corresponds to FanC. Wire color is standard.

Table 26-17. SFX Control Connector

Pin

Color

Signal

Pin

Color

Signal

1

NC

Reserved

4

NC

Reserved

2

blue

FanON/OFF

5

NC

Reserved

3

NC

Reserved

6

NC

Reserved

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Publisher Resources

ISBN: 059600513XErrata Page