Chapter 4 Motherboard Connections; Power Connections - Supermicro SuperServer SYS-221P-C9R User Manual

Motherboard Connections
This section describes the connections on the motherboard and provides pinout definitions.
Note that depending on how the system is configured, not all connections are required. The
LEDs on the motherboard are also described here. A motherboard layout indicating component
locations may be found in
Please review the Safety Precautions in

4.1 Power Connections

ATX Power Supply Connector
There are one 24-pin power supply connector (JPWR3) and three 8-pin 12 V DC power
connectors (JPWR1, JPWR2 and JPWR4) on the motherboard to provide adequate power
to your system. Refer to the table below for pin definitions.
ATX Power 24-pin Connector
Pin Definitions
Pin# Definition
13 +3.3 V
14 NC
15 Ground
16 PS_ON
17 Ground
18 Ground
19 Ground
20 Res (NC)
21 +5 V
22 +5 V
23 +5 V
24 Ground
Required Connection
Chapter 4
Chapter 1. More detail can be found in the
Appendix A
Pin# Definition
1 +3.3 V
2 +3.3 V
3 Ground
4 +5 V
5 Ground
6 +5 V
7 Ground
8 PWR_OK
9 5VSB
10 +12 V
11 +12 V
12 +3.3 V
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Chapter 4: Motherboard Connections
Motherboard
before installing or removing components.
12 V 8-pin Power
Pin Definitions
Pin# Definition
1 - 4 Ground
5 - 8 +12 V
Manual.