Asus ROG Strix X670E-A M2 drive issue

junpit · 20 Apr 2023 at 13:49

Hi

I’m having trouble getting a gen3 m2 drive from being detected. Before I RMA it, can someone explain if I’m missing something.

I have a single drive (gen4) connected to m2_1 (gen 5) and if I plug my gen3 drive into m2_3 (gen 5) it works fine. Plugged into m2_2 or m2_4 the motherboard takes an age to post and does not detect the drive.

This is leading me to think that the x670 gen 4 m2 side of things is broken. I’m on the latest bios.

Any help is greatly appreciated.

Thanks

Darren

Tetras · 20 Apr 2023 at 18:49

It could be that the board doesn't like running a gen 4 and gen 3 drive together on the CPU lanes, but it's fine with having a gen 4 drive on the CPU and a gen 3 drive on the chipset. Though, that doesn't explain why slot 4 doesn't work because that's a chipset slot. Do you have options in the BIOS to manually configure what PCI-E gen the slots are running at?

Jamin280672 · 20 Apr 2023 at 18:57

on my gene x670 im running a gen 4 in the M.2 Gen5 Slot on the motherboard, then I have the ROG Gen-Z card which has a Gen4 in the Gen5 slot on it and a Gen3 in the Gen4 slot on it, not sure if this helps, it should say in the manual which slots support what and what you lose by populating certain slots etc.

junpit · 20 Apr 2023 at 20:19

No reference in the manual but this was due to running a sata drive on sata4. I unplugged it and plugged it into sata1 and it’s now fine.

Jamin280672 · 20 Apr 2023 at 20:54

junpit said:
No reference in the manual but this was due to running a sata drive on sata4. I unplugged it and plugged it into sata1 and it’s now fine.

Surprised they didnt mention that in the manual, sounds like one of you M.2 drives is sharing the lanes with a couple of your sata ports, you probably find that the 4th M.2 slot shares lanes with one of the PCI-e x16 slots.

w00dy85 · 21 Apr 2023 at 09:05

Jamin280672 said:
Surprised they didnt mention that in the manual, sounds like one of you M.2 drives is sharing the lanes with a couple of your sata ports, you probably find that the 4th M.2 slot shares lanes with one of the PCI-e x16 slots.

I think your right and if this is true, surprised their is no mention of this in the manual.

I also have this same board and had no problems running gen4 and gen3 M.2 drives together.

junpit · 21 Apr 2023 at 10:59

This is awful. Just booted up and the drive has gone. Unplugging the sata makes no difference. I installed drivers, downloaded games last night without issue. I've rebooted several times. Doesn't help

junpit · 23 Apr 2023 at 09:13

Came to the conclusion it didn’t like the SN700 in the x670 m.2 slots. They work fine in the other cpu slots.

Read another article where soneone commented on the SN700 that it can’t negotiate down from x4 mode to x2 mode which it looks like it’s being asked to do.

eddiew · 24 Apr 2023 at 00:03

junpit said:
can’t negotiate down from x4 mode to x2 mode which it looks like it’s being asked to do.

Dumb question, why is it being asked to come down to x2? Can you identify what it's sharing with and shuffle something around to avoid that happening? Could you maybe get a pci-e m.2 riser card and put it in that without the conflict?

Tetras · 24 Apr 2023 at 01:04

junpit said:
Read another article where soneone commented on the SN700 that it can’t negotiate down from x4 mode to x2 mode which it looks like it’s being asked to do.

Would be odd if that's true, because in the SN700's datasheet it specifically says that it can support 2 lane operation.

"Backwards compatible with PCIe Gen3 x2, PCIe Gen2 x4, PCIe Gen2 x2, PCIe Gen2 x1, and PCIe Gen3 x1."

junpit · 24 Apr 2023 at 07:31

True but if doesn’t work in my mobo. My SN850 does however work in those slots. I can’t explain it.