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 |
Get PC Hardware in a Nutshell, 3rd Edition now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
