X399 Raid low performance
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=10553
Printed Date: 24 Jul 2025 at 10:23am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: X399 Raid low performance
Posted By: Pape
Subject: X399 Raid low performance
Date Posted: 29 Dec 2018 at 2:17am
HI,
Last week I decided to build a NVME raid of 3 drives and the result is subpar.
The system is:
Taichi x399. bios 3.30
Threadripper 1900x
32 GB g-skill at 2400
3 X Samsung 960 evo.
I performed single drive bench in ahci reaching the advertised speed from the drive. I enable the raid controller and do a single drive JBOD my performance on read drop to 2100 instead of the normal 3k. Write stay the same. If I do a 2 drives bench I have the normal 3.6K write and 4.2k read. If I do 3 drives I get 5.4K write and 6.2 read.
As you can see everything is consistent in number of drives and performance except I miss 1k in read for each drive in raid mode.
Any one got a idea why I have 3k read performance missing in my raid ?
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Replies:
Posted By: Pape
Date Posted: 29 Dec 2018 at 3:13am
Decided to test all 3 drives in AHCI and found out that slots 2 & 3 bench at 2.5K read. Slot 1 reach the 3.1K, this is in specs.
According to Samsung Magician all 3 drives are set to PCIe Gen 3 at 4X in good condition running the latest Firmware.
Will need to go dig down in the hardware....
The question continue to hold: any of you have a clue what can cause this ?
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