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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, 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 Denitions
Pin# Denition
1 Ground (Black)
2 +12V (Red)
3 Tachometer
4 PWM Control
Host Fabric Interface (HFI) Carrier Card Sideband Headers (only for F model CPUs)
Two Host Fabric Interface (HFI) carrier card headers are located at JHFI1/JHFI2 on the
motherboard. The JHFI headers are used when the F model processor is installed. Use an
HFI sideband cable to connect the carrier card to the JHFI headers, and use an appropriate
IFP (Internal-Faceplate-to-Processor) cable (available from Supermicro) to connect the carrier
card to the F model processor to enhance system performance. Note that in a dual-processor
system, JHFI1 is used for CPU1, and JHFI2 is for CPU2.
HFI Carrier Card Sideband Header
Pin Denitions
Pin# Denition Pin# Denition
1 Ground 2 SMB_HFI_0_SCL
3 HFI0_MODPRST_N 4 SMB_HFI_0_SDA
5 LED_HFI0_N 6 HFI0_RESET_N
7 Ground 8 HFI0_INT_N
9 Ground 10 SMB_HFI_1_SCL
11 HFI1_MODPRST_N 12 SMB_HFI_1_SDA
13 LED_HFI1_N 14 HFI1_RESET_N
15 Ground 16 HFI1_INT_N
17 Reserved 18 P3V3
19 P2V5_PWRGD 20 P3V3
21 P2V5 22 PCIe_SMBCLK
23 Ground 24 PCIe_SMBDAT
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