61
Chapter 4: Motherboard Connections
4.2 Headers and Connectors
Fan Headers
There are eight fan headers on the motherboard. These are 4-pin fan headers, although pins
1-3 are backward compatible with traditional 3-pin fans. Four-pin fans allow fan speeds to be
controlled by Thermal Management in IPMI. When using the Thermal Management setting,
use all 3-pin fans or all 4-pin fans.
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
T-SGPIO3 Header
A Serial General Purpose Input/Output header (T-SGPIO3) is located next to the TPM/Port
80 on the motherboard. This header is used to communicate with the enclosure management
chip on the backplane.
SGPIO Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
NC
2
NC
3
Ground
4
DATA Out
5
Load
6
Ground
7
Clock
8
NC
NC = No Connection
Disk-On-Module Power Connector
The Disk-On-Module (DOM) power connectors at JSD1 and JSD2 provide 5V power to a
solid-state DOM storage devices connected to one of the SATA ports.
DOM Power
Pin Definitions
Pin#
Definition
1
5V
2
Ground
3
Ground