New Asus X870E Strix board - M.2 drive disappearing

[Cheairnyndahl]

Hello, just installed my new Asus X870E-E Strix motherboard, loving it so far. When I initially got in to Windows, all of my drives were present (even the new one that wasn't formatted yet was showing in Disk Management) - I updated everything in terms of latest drivers for the motherboard etc, rebooted and enabled EXPO on my RAM, set to 6000MHz with voltages set, didn't touch any other settings...

And now one of my M.2 drives is not showing up in BIOS or in Windows?  I've tried changing the BIOS setting for Bifurcation to GPU+M.2 mode, that doesn't help.  Any suggestions as to what else I can try?  I have a feeling it's related to the whole thing of the GPU slot & the M.2-2 & M.2-3 sharing bandwidth, but the drive that's in one of them is showing up while the other is not now.
I'm going to try disabling EXPO & see if that helps for some reason... wouldn't make any sense if that was it, but perhaps the BIOS version I'm on is messing something up.

[Psamtik]

Looks like a LPC debug port

[AOMi]

BIOS Version 1003 (2025/01/23)

2x Samsung 990 Pro 4Tb at M2.1 & M2.2; Ryzen 9900X; 2x48 Gb G.Skill

After powering on PC sometimes it sees second M2.2, sometimes not. I press Ctrl-Alt-Del before booting to windows or press Reset to start again. Sometimes it helps and sees second M2.2, sometimes not and I repeat my reboot sequence.

Very annoyed.

So buggy board (and engineered poorly - CPU Arctic Liquid Freezer press hard to M2.1 radiator; can't insert/put off M2's without full remount of my RTX with extender plate that supports videocard in position - the screws holding the radiator just exactly under this extender plate and many more things), I'm extremely disappointed.

Garbage for a price of $750

[iamgarffi]

Don’t use M2_2 or 3. Use 4 and 5. 

[AOMi]

I have 4 M2's to insert. And I can't use 2 ports of 5? %!(@#%

Bought just 1.5 months ago. It's My last Asus product. 

[Psamtik]

You can still manage it so long as you are not using the 4x slot for anything else as you can grab a cheap m.2 card off the likes of Amazon or eBay for the 4th one and it won't cripple the GPU bandwidth like slots 2 and 3 will if you get them to work. 

It still gets me how something this obvious was so easily overlooked regardless of if this is an Asus or AMD issue.

[DarekGra]

The chipset minimally limits the throughput of M2 drives. In my case, drives in m2.1 to M2.3 reach throughput above 7300, the same drive already inserted into the m2.4 and m2.5 slot has a throughput of around 6890 MB/s. But you know, these few hundred MB are not a problem. In my case, so far it is stable, just like the drive disappeared, now after each restart it is currently visible without a problem, and I also have no problems with USB ports and WiFi

[AOMi]

I'm at the location where it's impossible. And even buying (not only additional but all) components is extremely hard in all senses.

[Psamtik]

Best bet then so long as you are not concerned with the gpu dropping to x8 is to set the ram profile to auto and then manually enter the timings. Since I have done this I have had zero issues with all 6 drives working with no issues, plus if you are up for a bit of tweaking you can get better performance out of the ram than the EXPO/DOCP profiles give you on top of slots 2 and 3 working. 

I would recommend saving the text version of the bios to usb if you do tweak the ram settings so you can see what you need to put in again if the future bios updates are not compatible with previous versions profiles.

If it helps, for my SK Hynix 48GB 6000 kit I use these timings with FCLK Frequency [2067 MHz]

Tcl [30]
Trcd [36]
Trp [36]
Tras [28]
Trc [68]
Twr [48]
Refresh Interval [65535]
Trfc1 [500]
Trfc2 [400]
Trfcsb [300]
Trtp [12]
TrrdL [8]
TrrdS [4]
Tfaw [20]
TwtrL [16]
TwtrS [6]
TrdrdScl [4]
TrdrdSc [1]
TrdrdSd [Auto]
Trdrddd [Auto]
TwrwrScl [4]
TwrwrSc [1]
TwrwrSd [Auto]
TwrwrDd [Auto]
Twrrd [2]
Trdwr [16]

[Cheairnyndahl]

That's the least helpful thing to say ever if you read the original post or most of the posts here complaining about it - WE HAVE MORE THAN 3 M.2 DRIVES lol

[Koalabear83]

I have asus tuf gaming x870 wifi plus and have the exact same problem..

M.2_1 slot and m.2_2  populated

slot 2 only MVME DOES NOT SHOW IN BIOS, SOMETIMES it shows up randomly most times it's not visible in bios.. what is this garbage? I went through nearly every possible trouble shoot