B450 PRO4 with Crossfire
Printed From: ASRock.com
Category: Technical Support
Forum Name: AMD Motherboards
Forum Description: Question about ASRock AMD motherboards
URL: https://forum.asrock.com/forum_posts.asp?TID=10210
Printed Date: 23 Jul 2025 at 10:13am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B450 PRO4 with Crossfire
Posted By: Miggs
Subject: B450 PRO4 with Crossfire
Date Posted: 19 Nov 2018 at 7:49pm
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Hi, I have the above board with both M2 slots occupied. I would like to try out Crossfire so presumably could just put the M2 card on a SATA adapter? How is Crossfire on this board, does it suffer with the second slot being x4? (Bit new to all this  )
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Replies:
Posted By: Xaltar
Date Posted: 20 Nov 2018 at 1:11am
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Welcome to the forums! Yes, you will need to free up the M2_1 slot if you plan to use the PCIe 4 slot for crossfire. As for the x4 speed limiting your performance, I wouldn't worry about it. Crossfire scaling is not 100% so you won't notice much, if any, performance difference using the x4 slot for the second GPU. AMD only requires an x4 slot for it's crossfire setup to work, that should tell you all you need to know. Just don't forget your crossfire bridge  ------------- 
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