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IMB520R / 521R LGA1151 ATX Motherboard
2.5.18
PCI-Express x1 Slots (PCIe5)
This motherboard has two PCI-Express x1 slots.
Pin
Signal
B1
+12V_PS
B2
+12V_PS
B3
+12V_PS
B4
GND
B5
SMB_CLK_RESUME
B6
SMB_DATA_RESUME
B7
GND
B8
+3.3V_PS
B9
N/C
B10
+3.3V_SB
B11
PCH_WAKE_N
B12
N/C
B13
GND
B14
PCIE5_SLOT_TX_DP_C
B15
PCIE5_SLOT_TX_DN_C
B16
GND
B17
N/C
B18
GND
2.5.19
Fan Connectors (FAN1~FAN3)
This motherboard has three fan connectors. Find fan speed option(s) at BIOS Setup
Utility: Advanced\HW Monitor\PC Health Status.
The FAN1 (4x1-pin p=2.54mm) is for the the CPU fan connector.
Pin
Signal
1
GND
2
+12V
3
FAN Speed Detection
4
FAN Speed Control
The FAN2 and FAN3 (4x1-pin p=2.54mm) are for system fan connectors.
Pin
Signal
1
GND
2
+12V
3
FAN Speed Detection
20
Pin
Signal
A1
GND
A2
+12V_PS
A3
+12V_PS
A4
GND
A5
N/C
A6
N/C
A7
N/C
A8
N/C
A9
+3.3V_PS
A10
+3.3V_PS
A11
PWRGD
A12
GND
A13
CLKOUT_PCIE_P8
A14
CLKOUT_PCIE_N8
A15
GND
A16
PCIE5_SLOT_RX_DP_C
A17
PCIE5_SLOT_RX_DN_C
A18
GND
Board and Pin Assignments
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