M.2 Issue, half speed on M.2.1, Full speed on M.2.2

[wolfman]

As the title suggests, I'm having an issue with my M.2 slots using a samsung 970 EVO plus nvme 1TB drive. I should also tell you that this drive is replacing a Samsung 960 EVO nvme 500GB drive that showed the same issue.

When I test the speed in the M.2.1 slot, located near the bottom of MB, my speed on Crystal disk mark 7 is 1802 read, 1813 write. When I use the M.2.2 slot, located near the CPU, I get the following results, 3268 read, 2880 write.

I am using the latest BIOS, 3004 from Asus. My MB is Asus ROG Crosshair VII Hero WIFi, CPU is a Ryzen 2700+, 16 Gb DDR4 3200RAM, windows 10.

I'm just wondering why the speed is basically cut in half using the M.2.1 slot. I have reset the BIOS to default and nothing works as far as getting full speed on the M.2.1 slot.

Any suggestions?

[davemon50]

Looks familiar. This you?
https://rog.asus.com/forum/showthrea...hlight=samsung

[wolfman]

Looks familiar. This you?
https://rog.asus.com/forum/showthrea...hlight=samsung

No, not me, but I'll look it over and see if it will help. At least I'm not crazy and someone else has had the issue.

[davemon50]

Sounds exactly the same.

[wolfman]

As I stated the first time you asked me, that is not my post.

I'm just looking for some assistance on the issue that I'm having.

[davemon50]

Yes I know that. Agreeing that the issue sounds exactly the same, not calling you a liar.


Did the other thread help you or no? You never reported back.

[wolfman]

Finally got some time to do a secure erase from BIOS and then did a restore with Macrium and same result. Faster on the M.2.2 than M.2.1. I even did a fresh install of Windows 10, installed all the MB drivers, etc., samsung NVME driver and same result on a fresh Windows 10 install, faster on M.2.2 than M.2.1.

It's not an OS issue, I've been over the BIOS settings again and again looking to see If I've missed anything, and I am at a loss to explain this.

[Baio73]

As the title suggests, I'm having an issue with my M.2 slots using a samsung 970 EVO plus nvme 1TB drive. I should also tell you that this drive is replacing a Samsung 960 EVO nvme 500GB drive that showed the same issue.

When I test the speed in the M.2.1 slot, located near the bottom of MB, my speed on Crystal disk mark 7 is 1802 read, 1813 write. When I use the M.2.2 slot, located near the CPU, I get the following results, 3268 read, 2880 write.

I am using the latest BIOS, 3004 from Asus. My MB is Asus ROG Crosshair VII Hero WIFi, CPU is a Ryzen 2700+, 16 Gb DDR4 3200RAM, windows 10.

I'm just wondering why the speed is basically cut in half using the M.2.1 slot. I have reset the BIOS to default and nothing works as far as getting full speed on the M.2.1 slot.

Any suggestions?

Hi,
Asus made a little mess with this board* as they called the upper slot (the nearest to the CPU socket) M.2_2 and the bottom one M.2_1 (which is not so intuitive as the PCIEX slots are numbered starting from the upper one).
So the upper slot is the slower, as it shares ìlines with PCIEX slot 1 (where one usually plugs the VGA) and the bottom slot is the faster, as it does not share anything.
Hope this may help!

Baio

* I've just discovered that USB15 header can't drive 2 USB ports… so a topboard like this has only 3 onboard USB ports… WTF!!!

[wolfman]

Hi,
Asus made a little mess with this board* as they called the upper slot (the nearest to the CPU socket) M.2_2 and the bottom one M.2_1 (which is not so intuitive as the PCIEX slots are numbered starting from the upper one).
So the upper slot is the slower, as it shares ìlines with PCIEX slot 1 (where one usually plugs the VGA) and the bottom slot is the faster, as it does not share anything.
Hope this may help!

Baio

* I've just discovered that USB15 header can't drive 2 USB ports… so a topboard like this has only 3 onboard USB ports… WTF!!!

Thanks for the reply. I understand the information regarding M.2.1 and M.2.2. My issue is that M.2.1 is HALF the speed of M.2.2. My 970 evo has a speed of 1802 read, 1813 write in the M.2.1 location and a speed of 3268 read, 2880 write in the M.2.2 location.

[Baio73]

Thanks for the reply. I understand the information regarding M.2.1 and M.2.2. My issue is that M.2.1 is HALF the speed of M.2.2. My 970 evo has a speed of 1802 read, 1813 write in the M.2.1 location and a speed of 3268 read, 2880 write in the M.2.2 location.

Sorry for the misunderstanding… you are the first user I read of to have the inverse problem.
Maybe a full list of your configuration may help, but for sure M.2_1 does not share anything with the rest of the system, so the problem is really misterious.
Did you try to open a ticket with Asus assistance?
Did you try the SSD in another pc to see what performance it has?
At the moment I can't think of anything else, apart for a BIOS flash using the flashback method.

Baio