Can get PCI Gen3 x 4 on M.2 port

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   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.

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Spektre Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Mar 2019 Status: Offline Points: 26	Post Options Post Reply Quote Spektre Report Post Thanks(0) Quote Reply Topic: Can get PCI Gen3 x 4 on M.2 port 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.

Xaltar Members Profile Send Private Message Find Members Posts Add to Buddy List Moderator Group Joined: 16 May 2015 Location: Europe Status: Offline Points: 23048	Post Options Post Reply Quote Xaltar Report Post Thanks(0) Quote Reply 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.


Spektre Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Mar 2019 Status: Offline Points: 26	Post Options Post Reply Quote Spektre Report Post Thanks(0) Quote Reply 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.

Spektre Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Mar 2019 Status: Offline Points: 26	Post Options Post Reply Quote Spektre Report Post Thanks(0) Quote Reply 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.

Spektre Members Profile Send Private Message Find Members Posts Add to Buddy List Newbie Joined: 05 Mar 2019 Status: Offline Points: 26	Post Options Post Reply Quote Spektre Report Post Thanks(0) Quote Reply 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. .