B450 ITX

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   I have a 9070 XT installed on my Asrock B450 ITX motherboard. The AMD driver software is reporting that the PCI-E bus is running at PCI-E 3.0 x8 despite the motherboard supporting PCI-E 3.0 x16 mode. I heard from other brands that installing a M.2 drive will reduce the GPU PCI-E slot speed from x16 to x8, but I'm not sure whether this applies to the Asrock B450 ITX specifically because I can't find any mention of this in the motherboard manual. I do have a M.2 SSD installed.

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corsair17 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Dec 2025 Status: Offline Points: 45	Post Options Post Reply Quote corsair17 Report Post Thanks(0) Quote Reply Topic: B450 ITX Posted: 15 Dec 2025 at 5:24am
	I have a 9070 XT installed on my Asrock B450 ITX motherboard. The AMD driver software is reporting that the PCI-E bus is running at PCI-E 3.0 x8 despite the motherboard supporting PCI-E 3.0 x16 mode. I heard from other brands that installing a M.2 drive will reduce the GPU PCI-E slot speed from x16 to x8, but I'm not sure whether this applies to the Asrock B450 ITX specifically because I can't find any mention of this in the motherboard manual. I do have a M.2 SSD installed.

corsair17 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Dec 2025 Status: Offline Points: 45	Post Options Post Reply Quote corsair17 Report Post Thanks(0) Quote Reply Posted: 15 Dec 2025 at 5:37am
	And if it matters, I have a 5700X3D CPU installed. The motherboard BIOS is flashed to the latest version (10.43 Beta).

corsair17 Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 15 Dec 2025 Status: Offline Points: 45	Post Options Post Reply Quote corsair17 Report Post Thanks(0) Quote Reply Posted: 9 hours 47 minutes ago at 9:01am
	I re-seated by PCI-E riser cable and it's reporting x16 now. Problem fixed.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 32218	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply Posted: 1 hour 1 minutes ago at 5:47pm
	Thanks for the update corsair17. I was looking into possible causes for you but got distracted by holiday prep and forgot about your post, sorry. Step 1 in any situation like this is always reseat everything relevant to the issue Glad you got it sorted out.