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

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   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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kwieszcz Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 22 Mar 2024 Status: Offline Points: 150	Post Options Post Reply Quote kwieszcz Report Post Thanks(0) Quote Reply Topic: B450M-HDV R4.0 won't boot without ATX12v1 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?

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 22748	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply 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