Chapter 4 Motherboard Connections; Power Connections - Supermicro SYS-521C-NR 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 Appendix A before installing or removing components.

4.1 Power Connections

Power Connections
Power Connectors
JPWR1 is the 24-pin power connector for ATX power source. JPWR2 and JPWR3 are the
8-pin 12V DC power connectors that provide power to the CPU in conjunction with JPWR1
or they can be used as the sole 12V DC only power inputs when JPWR1 is not in use.
ATX Power 24-pin Connector
Pin# Definition
13 +3.3V
14 -12V
15 Ground
16 PS_ON
17 Ground
18 Ground
19 Ground
20 Res (NC)
21 +5V
22 +5V
23 +5V
24 Ground
Chapter 4
Chapter
Pin Definitions
Pin# Definition
1 +3.3V
2 +3.3V
3 Ground
4 +5V
5 Ground
6 +5V
7 Ground
8 PWR_OK
9 5VSB
10 +12V
11 +12V
12 +3.3V
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Chapter 4: Motherboard Connections
1.
8-pin CPU Power
Pin Definitions
Pin# Definition
1-4 GND
5-8 12V