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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; pins 1-3 are
backward compatible with traditional 3-pin fans. The onboard fan speeds are monitored and
controlled by BMC. Use 4-pin fan headers for fan speed control support.
Fan Header
Pin Definitions
Pin#
Definition
1
Ground (Black)
2
+12V (Red)
3
Tachometer
4
PWM Control
TPM Header
The JTPM1 header is used to connect a Trusted Platform Module (TPM)/Port 80, which is
available from SMCI (optional). A TPM/Port 80 connector is a security device that supports
encryption and authentication in hard drives. It allows the motherboard to deny access if the
TPM associated with the hard drive is not installed in the system. See the table below for
pin definitions.
Trusted Platform Module/Port 80 Header
Pin Definitions
Pin#
Definition
Pin#
Definition
1
P3V3
2
SPI_TPM_CS_N
3
PCIE_RESET_N#
4
SPI_PCH_MISO
5
SPI_PCH_CLK#
6
Ground
7
SPI_PCH_MOSI
8
N/A
9
JTPM1_P3V3A
10
IRQ_TPM_SPIN_N
NVMe SMBus Headers
NVMe SMBus (I
2
C) headers (JNVI
2
C1/JNVI
2
C2), used for PCI-E SMBus clock and data
connections, provide hot-plug support via a dedicated SMBus interface. This feature is only
available for a Supermicro complete system with an SMCI-proprietary NVMe add-on card
and cable installed. See the table below for pin definitions.
NVMe SMBus Header
Pin Definitions
Pin#
Definition
1
Data
2
Ground
3
Clock
4
VCCIO
