Z97E-ITX/AC Bifurcation
Printed From: ASRock.com
Category: Technical Support
Forum Name: Intel Motherboards
Forum Description: Question about ASRock Intel Motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=113270
Printed Date: 22 Jul 2025 at 1:35am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Z97E-ITX/AC Bifurcation
Posted By: ClayFace
Subject: Z97E-ITX/AC Bifurcation
Date Posted: 21 Jul 2025 at 10:37am
| Hello, I have a Z97E-ITX/AC mobo, bios version P2.20. I upgraded the unit from Win7 Home to Win10 Enterprise edition (clean install). My problem is that the PC no longer displays the PCIE slot X16, primary GPU (GeForce GT 740 2gb) in the device manager. There was already a (1 x 2 riser card) installed in the unit so I'm thinking I may need to update the bios to a version that enables PCIE bifurcation. This is just my assumption. Can someone tell me which bios version I'll need for this or is there something else going on that causing my problem.. Thank you so much |
Replies:
Posted By: Xaltar
Date Posted: 21 Jul 2025 at 5:35pm
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So the only thing that changed is the OS install? No hardware or BIOS changes/updates? ------------- 
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Posted By: ClayFace
Date Posted: 21 Jul 2025 at 7:26pm
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Good morning, I also updated the bios to the latest version P2.20. After the initial Win 10 install the card was detected but after running the first Windows Update > (View optional updates) the X16 slot was no longer there/ detected. The unit has an i7 3.2 GHz processor and PCIe 3.0 interface on board.. Thank you |
Posted By: ClayFace
Date Posted: 21 Jul 2025 at 7:32pm
| I have also did a system restore at that point but card was still not being detected. Thank you |
Posted By: Xaltar
Date Posted: 22 Jul 2025 at 12:08am
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Try clearing CMOS and see if that helps. If the update changed something to cause it to stop working that may help. You can additionally try using a bootable USB linux distro and check if the card shows up under linux. You can boot directly from a USB drive and don't need to install the OS on your system. -------------
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