Intel Motherboards - H81 Not recognizing PCI bus 4, 2 boards failed

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H81 Not recognizing PCI bus 4, 2 boards failed

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=5742
Printed Date: 31 Jul 2025 at 10:06am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: H81 Not recognizing PCI bus 4, 2 boards failed

Posted By: Darksoul
Subject: H81 Not recognizing PCI bus 4, 2 boards failed
Date Posted: 30 Jul 2017 at 12:00am

" rel="nofollow - As the title says, I have a mining rig running the ASRock H81 BTC R2.0 , it is connected via risers to 6 Geforce 1070 GPU's running on Windows 10 64. When I turn the machine on and go look for the cards in the device manager, it only sees 5 of the 6 cards, and when I select properties for each card, bus 4 is always the missing bus/GPU.

I have tested the risers and the GPU's independently finding no problems with that hardware.

I am not really a PC guy, so this is all new to me, the only thing I can maybe think of is that it is using an older Intel Celeron G1840 processor, maybe its too much to handle? if that makes any sense.

Last, I have replaced the mobo with another H81 and the same problem persists, fails to recognize PCI bus 4

Any insight would be greatly appreciated.

Replies:

Posted By: 7rank99
Date Posted: 21 Nov 2017 at 5:25am

" rel="nofollow - I'm really surprised that you got 5/6 1070's to work. I can only get 3 to work consistently. I have the same G1840 processor with the same board. Did PCI bus 4 give you the error code 12, something about not having enough resources?