ASRock Forums : 4 Graphics Cards on Z170 OC Formula https://forum.asrock.com/ Copyright (c) 2006-2013 Web Wiz Forums - All Rights Reserved. Tue, 23 Jun 2026 00:16:03 +0000 Wed, 11 Jan 2017 11:03:04 +0000 http://blogs.law.harvard.edu/tech/rss Web Wiz Forums 12.04 360 https://forum.asrock.com/RSS_post_feed.asp?TID=4218 <![CDATA[ASRock Forums]]> https://forum.asrock.com/forum_images/web_wiz_forums_black.png https://forum.asrock.com/ <![CDATA[4 Graphics Cards on Z170 OC Formula : Hello,I would like to use 4 GTX...]]> https://forum.asrock.com/forum_posts.asp?TID=4218&PID=22006&title=4-graphics-cards-on-z170-oc-formula#22006 Author: ggsato
Subject: 4218
Posted: 11 Jan 2017 at 11:03am

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!
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