Can get PCI Gen3 x 4 on M.2 port
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=11023
Printed Date: 28 Jul 2025 at 10:09am
Software Version: Web Wiz Forums 12.04 - http://www.webwizforums.com
Topic: Can get PCI Gen3 x 4 on M.2 port
Posted By: Spektre
Subject: Can get PCI Gen3 x 4 on M.2 port
Date Posted: 05 Mar 2019 at 12:58pm
|
Hi. I have a x470 Master SLI/ac board. In the proper M.2 port (the one under the heatsink) I have a Samsung 970 EVO SSD. It is running quite slowly. I found it is only communicating with 2 PCIe channels (PCI ver 3 x2), not 4 as it should. Is there a BIOS setting or something else I should be doing to allow for 4 channels of PCIe to this SSD? Thanks. |
Replies:
Posted By: Xaltar
Date Posted: 05 Mar 2019 at 5:23pm
|
We need more information, most importantly your full system specs, particularly anything populating your PCIe slots and your CPU. If you are using an Athlon 2xxGE for example, then PCIe 3.0 x2 is correct as the Athlon has less PCIe lanes than it's Ryzen counterparts. ------------- 
|
Posted By: Spektre
Date Posted: 05 Mar 2019 at 10:46pm
|
Thanks for the quick reply. My system is a Ryzen 2700X. There is 1 GTX1070 in the PCIe slot, though I hope to SLi 2 1070s. I removed one to see if this allocated another PCIe lane to the drive. I am running Windows 10 Pro 64 bit. The other nvme slot is empty. 32G of RAM. |
Posted By: Spektre
Date Posted: 06 Mar 2019 at 11:04am
|
I moved the 970 EVO and the GPU to an MSI x470 system. It is also a Ryzen 7 2700X It correctly communicates at PCI3.0 x4 and the performance is nearly doubled as expected. |
Posted By: Spektre
Date Posted: 17 Mar 2019 at 8:57am
|
ASRock RMAd by previous motherboard and the new one is even worse. It does not even see the 970 nvme drive in the M.2 slot. . |