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Chapter 4: Motherboard Connections
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 dedicated SMBus interface. This feature is only
available for a Supermicro complete system with an SMCI-proprietary NVMe add-on card
and cable installed for each NVMe SMBus header supported. See the table below for pin
definitions.
NVMe SMBus Header
Pin Definitions
Pin#
Definition
1
Data
2
Ground
3
Clock
4
VCCIO
Host Fabric Interface (HFI) Carrier Card Sideband Headers
(Available when F model CPUs are used)
Two Host Fabric Interface (HFI) carrier card headers are located at JHFI1/JHFI2 on the
motherboard. These headers will only work properly when an F model processor is installed
on the the corresponding CPU socket (JHFI1: CPU1, JHFI2: CPU2). After ensuring that an F
model CPU is properly seated in the corresponding CPU socket, please use an HFI sideband
cable to connect the carrier card to the JHFI header, and then use an optional IFP (Internal-
Faceplate-to-Processor) cable to connect the carrier card to the F model CPU that is seated
in the Socket. (See Note below). See page 34 for the installation instructions.
Notes:
1. For an HFI carrier card to function properly, please purchase the appropriate IFP cable
from Supermicro. Please refer to Supermicro's website at
for the
part number of the IFP cable specified for your system.
2. JHFI1 (when an F model CPU is installed in CPU Socket1)
3. JHFI2 (when an F model CPU is installed in CPU Socket2)
