B460 Phantom Gaming 4 PCIe Speeds
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=18213
Printed Date: 27 Jul 2025 at 8:40pm
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: B460 Phantom Gaming 4 PCIe Speeds
Posted By: Bobat
Subject: B460 Phantom Gaming 4 PCIe Speeds
Date Posted: 24 Feb 2021 at 4:09am
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I have a B460 Phantom Gaming 4, which has 2 x16 PCIe slots. The manual states that the PCIe1 operates at x16 if PCIe3 is empty, and PCIe1 operates at x16 and PCIe3 operates at x4 if both slots are used. Is this true even if the card in PCIe1 is only an x8 card? I was hoping PCIe1 and PCIe3 could both operate at x8 if both were only x8 cards. |
Replies:
Posted By: Xaltar
Date Posted: 24 Feb 2021 at 4:05pm
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No, looking at the images on your product page the PCIe3 slot is only electrically wired as an x4 slot. This is common with most mid tier intel chipset boards and I believe is a stipulation from intel to ensure that only their top tier boards, that are licensed for SLI, can use x8 + x8 configs. There have been some boards that permit x8 + x8 in the mid range but they tend to be expensive and use PCIe lane multipliers (PLX chip). So to clarify, the PCIe3 slot is an x4 slot. It is an x16 physical slot that is wired as an x4 slot. You can see how the pins in the slot only extend to about a third of the length of the slot vs PCIe1 which has pins all the way to the end. ------------- 
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