ASRock Forums : USB-Pcie conflict? Fm2a75 Pro4 https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Thu, 28 May 2026 19:48:57 +0000 Sun, 11 Feb 2018 01:45:12 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=7634 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[USB-Pcie conflict? Fm2a75 Pro4 : I can&#039;t seem to get my PCIE1...]]> https://forum.asrock.com/forum_posts.asp?TID=7634&PID=44951&title=usbpcie-conflict-fm2a75-pro4#44951 Author: jsid
Subject: 7634
Posted: 11 Feb 2018 at 1:45am

I can't seem to get my PCIE1 slot to register the presence of a card anymore. I'm getting error B4 B3. (USB hot plug and ... CPU?)

I get the same error even when there are no USB slots occupied (except a 2.0 keyboard for input) if PCIE1 is occupied. It'll eventually POST, though it takes a while. In EFI setup, System Browser cannot see anything in PCIE1 or any of my on-board USB3 ports (I can still boot from USB3 "Win10 To Go" presumably at 2 speed, but the PCIE1 slot doesn't wake up)

PCIE slots 2-3-4 are occupied by Radeon 7950 GPUs, same that I'm attempting to plug in to PCIE1. The configuration has worked fine for years, but somethings not working now. Any suggestions?

Other specs: 

PSU is OCZ 1000W 80+
CPU is A4-4000
8G PNY DDR3 (4X2)

My EFI setup is unlocked, if that opens up any useful configs or tools. 







]]> Sun, 11 Feb 2018 01:45:12 +0000 https://forum.asrock.com/forum_posts.asp?TID=7634&PID=44951&title=usbpcie-conflict-fm2a75-pro4#44951