B450M-HDV R4.0 won't boot without ATX12v1
Printed From: ASRock.com
Category: Media&User's Review
Forum Name: AMD Motherboards
Forum Description: ASRock AMD Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=33499
Printed Date: 27 Dec 2024 at 5:20pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
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? |
Replies:
Posted By: Xaltar
Date Posted: 27 Mar 2024 at 8:37am
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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. ------------- 
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