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x399 2950x PCIe settings for LSI HBA

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=9696
Printed Date: 22 Jul 2025 at 8:38am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com


Topic: x399 2950x PCIe settings for LSI HBA
Posted By: blurb2m
Subject: x399 2950x PCIe settings for LSI HBA
Date Posted: 16 Sep 2018 at 4:34am
" rel="nofollow - I have been able to get my system to function pretty well since last nights build but my LSI 9211-8i HBA card is running VERY slow. I'm getting 8.7MB/s write speeds.

I am trying to find any information I can on the PCIe Slot Configuration and the different modes.
x399 Taichi
Threadripper 2950x
32GB GSkill 3200 (B-Die) RAM Dual Channel
I have a GTX 1050 in Slot 1
LSI 9211-8i in Slot 2 (Card is x8 PCIe 2.0

BIOS Config: Advanced/AMD PBS
PCIe x16 Switch - Auto
Promontory PCIe Switch - Auto
NVMe RAID mode - Disabled
PCIe Slot1 Configuration  - x16 Mode
PCIe Slot2 Configuration - x8 Mode
PCIe Slot4 Configuration - x16 Mode
PCIe Slot5 Configuration - x8 Mode

What is the x4x4 Mode on Slot2?


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