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Version 1.0
Published September 2020
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infringe.
Disclaimer:
Specications and information contained in this documentation are furnished for
informational use only and subject to change without notice, and should not be
constructed as a commitment by ASRock. ASRock assumes no responsibility for
any errors or omissions that may appear in this documentation.
With respect to the contents of this documentation, ASRock does not provide
warranty of any kind, either expressed or implied, including but not limited to
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In no event shall ASRock, its directors, ocers, employees, or agents be liable for
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even if ASRock has been advised of the possibility of such damages arising from any
defect or error in the documentation or product.
is device complies with Part 15 of the FCC Rules. Operation is subject to the following
two conditions:
(1) this device may not cause harmful interference, and
(2) this device must accept any interference received, including interference that
may cause undesired operation.
CALIFORNIA, USA ONLY
e Lithium battery adopted on this motherboard contains Perchlorate, a toxic substance
controlled in Perchlorate Best Management Practices (BMP) regulations passed by the
California Legislature. When you discard the Lithium battery in California, USA, please
follow the related regulations in advance.
“Perchlorate Material-special handling may apply, see www.dtsc.ca.gov/hazardouswaste/
perchlorate”
ASRock Website: http://www.asrock.com
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Our goods come with guarantees that cannot be excluded under the Australian
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e terms HDMI® and HDMI High-Denition Multimedia Interface, and the
HDMI logo are trademarks or registered trademarks of HDMI Licensing LLC in the
United States and other countries.
1
English
B450M/ac R2.0
Motherboard Layout
34
2
6
5
7
8
1
14
17
16
18
19 13
BIOS
ROM
ATXPWR1
Super
I/O
CLRCMOS1
1
PCIE1
1
USB_3_4
HD_AUDIO1
1
CPU_FAN1
Top:
LIN E IN
Center:
FRONT
Bottom:
MIC I N
RJ-45 LAN
USB 2.0
T: USB1
B: USB2
SOCKETAM4
CMOS
Battery
ATX12V1
M2_1
Ultra M.2
PCIe Gen3 x4
USB3_5_6
1
CHA_FAN1
CHA_FAN2
HDLED RESET
PLED PWRBTN
PANEL1
1
RoHS
SPK_PLED1
1
DDR4_A1 (64 bit, 288-pin module)
DDR4_A2 (64 bit, 288-pin module)
DDR4_B1 (64 bit, 288-pin module)
DDR4_B2 (64 bit, 288-pin module)
PCIE2
AMD
Promontory
B450
USB 3.2 Gen1
T: USB1
B: USB2
USB 3.2 Gen1
T: USB3
B: USB4
1
AMD_FAN_LED1
1
USB_7
1
M2_1_CT3M2_1_CT2M2_1_CT1
1
USB_5_6
22
23
HDMI1
M2_WIFI
20
ADDR_LED1
1
RGB_HEADER1
B450M/ac
CI1
15
21
10
11
12
SATA3_3
SATA3_4
SATA3_1
SATA3_2
9
English
2
No. Description
1 ATX 12V Power Connector (ATX12V1)
2 CPU Fan Connector (CPU_FAN1)
3 2 x 288-pin DDR4 DIMM Slots (DDR4_A1, DDR4_B1)
4 2 x 288-pin DDR4 DIMM Slots (DDR4_A2, DDR4_B2)
5 AMD Fan LED Header (AMD_FAN_LED1)
6 ATX Power Connector (ATXPWR1)
7 USB 3.2 Gen1 Header (USB3_5_6)
8 AMD LED Fan USB Header (USB_7)
9 SATA3 Connector (SATA3_3)(Upper)
10 SATA3 Connector (SATA3_4)(Lower)
11 SATA3 Connector (SATA3_2)(Lower)
12 SATA3 Connector (SATA3_1)(Upper)
13 System Panel Header (PANEL1)
14 Power LED and Speaker Header (SPK_PLED1)
15 Chassis Intrusion Header (CI1)
16 Chassis Fan Connector (CHA_FAN2)
17 USB 2.0 Header (USB_3_4)
18 USB 2.0 Header (USB_5_6)
19 Clear CMOS Jumper (CLRCMOS1)
20 RGB LED Header (RGB_HEADER1)
21 Addressable LED Header (ADDR_LED1)
22 Front Panel Audio Header (HD_AUDIO1)
23 Chassis/Water Pump Fan Connector (CHA_FAN1)
3
English
B450M/ac R2.0
I/O Panel
No. Description No. Description
1 LAN RJ-45 Port* 6 USB 3.2 Gen1 Ports (USB3_1_2)
2 Line In (Light Blue)** 7 HDMI Port
3 Front Speaker (Lime)** 8 USB 2.0 Ports (USB_1_2)
4 Microphone (Pink)** 9 Antenna Ports
5USB 3.2 Gen1 Ports (USB3_3_4)
* ere are two LEDs on each LAN port. Please refer to the table below for the LAN port LED indications.
Activity / Link LED Speed LED
Status Description Status Description
O No Link O 10Mbps connection
Blinking Data Activity Orange 100Mbps connection
On Link Green 1Gbps connection
ACT/LINK LED
SPEED LED
LAN Port
6 589 7
1
4
3
2
** Function of the Audio Ports in 7.1-channel Conguration:
Port Function
Light Blue (Rear panel) Rear Speaker Out
Lime (Rear panel) Front Speaker Out
Pink (Rear panel) Central /Subwoofer Speaker Out
Lime (Front panel) Side Speaker Out