Intel Motherboards - 4 Graphics Cards on Z170 OC Formula

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4 Graphics Cards on Z170 OC Formula

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=4218
Printed Date: 22 Jul 2025 at 9:55am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com

Topic: 4 Graphics Cards on Z170 OC Formula

Posted By: ggsato
Subject: 4 Graphics Cards on Z170 OC Formula
Date Posted: 11 Jan 2017 at 11:03am

" rel="nofollow - Hello,

I would like to use 4 GTX 1080s on my Z170 OC Formula.

But if I install 4 of them, SATAs and some of USBs do not get detected. Thus, the machine won't boot up with the error code A2.

According to the manual, both of 3 graphics cards config and 4 graphics cards config consume 20 lanes. The former works without any issues, but it seems the latter has more constraints as above.

I know Z170 has only up to 26 HSIO lanes, and in which PCIe, SATAs, and USBs lanes are shared. So I looked for such details about the design of this board how lanes are shared, but didn't find any.

Is there such information available?

Thanks!