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

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kwieszcz View Drop Down
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    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?
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Xaltar View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Xaltar Quote  Post ReplyReply Direct Link To This Post 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
now.

Edited by Xaltar - 27 Mar 2024 at 8:41am
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