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B450M-HDV R4.0 won't boot without ATX12v1

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Category: Media&User's Review
Forum Name: AMD Motherboards
Forum Description: ASRock AMD Motherboards
Printed Date: 20 Jun 2024 at 7:52pm
Software Version: Web Wiz Forums 12.04 -

Topic: B450M-HDV R4.0 won't boot without ATX12v1
Posted By: kwieszcz
Subject: B450M-HDV R4.0 won't boot without ATX12v1
Date Posted: 27 Mar 2024 at 6:42am
My B450M-HDV R4.0 with Ryzen 3 4100 won't boot if ATX12v1 isn't connected. When I have only the x24 ATX connected the cpu fans spin but it won't boot. Is the ATX12v1 required for this mobo?

Posted By: Xaltar
Date Posted: 27 Mar 2024 at 8:37am
Yes, the 12v 4 or 8 pin connector provides power to the CPU. It is provided separately
from the 24pin connector for stability purposes. All the power used by the board
other than the CPU is handled by the 24 pin connector, PCIe power, USB power, all
of it. If the CPU also got it's power from the 24pin it would be subjected to
spikes and dips in power and become unstable. This has been the trend for a long time


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