https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Mon, 20 Apr 2026 02:23:24 +0000 Wed, 27 Mar 2024 08:37:59 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=33499 https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ https://forum.asrock.com/forum_posts.asp?TID=33499&PID=115714&title=b450mhdv-r4-0-wont-boot-without-atx12v1#115714 Author: Xaltar
Subject: 33499
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]]> Wed, 27 Mar 2024 08:37:59 +0000 https://forum.asrock.com/forum_posts.asp?TID=33499&PID=115714&title=b450mhdv-r4-0-wont-boot-without-atx12v1#115714 https://forum.asrock.com/forum_posts.asp?TID=33499&PID=115713&title=b450mhdv-r4-0-wont-boot-without-atx12v1#115713 Author: kwieszcz
Subject: 33499
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?]]> Wed, 27 Mar 2024 06:42:39 +0000 https://forum.asrock.com/forum_posts.asp?TID=33499&PID=115713&title=b450mhdv-r4-0-wont-boot-without-atx12v1#115713