MSI B660-A PRO DDR4 User Manual

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Important
Make sure that all the power cables are securely connected to a proper ATX power
supply to ensure stable operation of the motherboard.
CPU_PWR1~2, ATX_PWR1: Power Connectors
These connectors allow you to connect an ATX power supply.
CPU_PWR1
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 Ground 4 Ground
5 +12V 6 +12V
7 +12V 8 +12V
ATX_PWR1
Pin Signal Name Pin Signal Name
1 +3.3V 2 +3.3V
3 Ground 4 +5V
5 Ground 6 +5V
7 Ground 8 PWR OK
9 5VSB 10 +12V
11 +12V 12 +3.3V
13 +3.3V 14 -12V
15 Ground 16 PS-ON#
17 Ground 18 Ground
19 Ground 20 Res
21 +5V 22 +5V
23 +5V 24 Ground
5
4 1
8
CPU_PWR1
24
131
12
ATX_PWR1
3
2 1
4
CPU_PWR2
CPU_PWR2
Pin Signal Name Pin Signal Name
1 Ground 2 Ground
3 +12V 4 +12V

MSI B660-A PRO DDR4 Specifications

General

Chipset	Intel B660
Memory Type	DDR4
Form Factor	ATX
Socket	LGA 1700
Memory Slots	4
Maximum Memory	128 GB
PCIe x1 Slots	2
M.2 Slots	2
SATA Ports	6
Audio	Realtek ALC897
RAID Support	RAID 0, 1, 5, 10
USB Ports	USB 3.2 Gen 2x2 (1), USB 3.2 Gen 2 (1), USB 3.2 Gen 1 (2), USB 2.0 (2)