Secondary M2 disk not working after installing new graphic card

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ivan0590_SPAIN

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Apr 4, 2017
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Hello everyone, I hope you could help me.

I have an Asus Prime Z270-A motherboard with two M2 disks installed (2 Samsung 960 EVO, 250GB and 500GB) and my power supply is a Corsair RM750X. Today I installed my new graphic card (Asus ROG-STRIX-GTX1080TI-O11G-GAMING). Previously my graphic card was a GTX 970 Gaming G1 and I had both M2 disks running in PCIE x4 without problem.
Now with the new card I can only use the main M2 disk because the PCIE mode in the secondary disk is automatically change to X2 when the system starts and the Samsung 960 EVO requires PCIE X4 to work.

There's something I could do to fix the issue without having to replace any hardware?
The good thing is that all this hardware is new, so I could return something if I need to and get someting better. But I would prefer not to do it.
 
Solution
DRagor
GPU takes IO lanes from CPU (all 16 it has, both 970 and 1080 ti use the same). Drives take IO lanes from motherboard chip, and Z270 has easily enough of them for all your drives.
One thing to check would be if your second M.2 didn't become loose in its slot after installing.
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ivan0590_SPAIN

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No. I have two drives connected to SATA 3 and 4, because SATA 1 can be disabled by setting the SATA mode in the M2_1 and SATA 5 and 6 are disabled by X4 mode in M2_2. I could use SATA 1 since the primary M2 is set to PCIE but I prefer to have them in 3 and 4.

Before writing this post I tested to disconnect the SATA drives while setting the M2_2 mode to X4, but it didn't work.
 
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DRagor

DRagor

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It should not happen then (unless you forgot to save changes in BIOS before rebooting). I guess you should contact Asus customer support and ask them why BIOS overrides your selection. I can't find any logical reason why it would do so.
 
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ivan0590_SPAIN

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No, like I said the BIOS settings are applied but after that the system fails to start, so it reboots again and sets the M2_2 mode to X2.

Motherboards are not my strength but, can the problem be related to the max bandwidth the motherboard can take? (Maybe this is a very ignorant question, sorry if that is the case). I said this because I'm using two PCIE drives plus one of the most powerfull graphics cards on the market with factory overclock. I didn't have any issues with the GTX970, so maybe the problem is that the 1080Ti in conjunction with the PCIE drives hit a limit and the motherboard takes action.
But this is just pure speculation.

Anyway, I will contact Asus tomorrow. Thanks.
 
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DRagor

DRagor

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GPU takes IO lanes from CPU (all 16 it has, both 970 and 1080 ti use the same). Drives take IO lanes from motherboard chip, and Z270 has easily enough of them for all your drives.
One thing to check would be if your second M.2 didn't become loose in its slot after installing.
 
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Solution
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ivan0590_SPAIN

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Bingo! That was the damn problem!
In my defense I will say that this is the first time I install M2 drives.
Let me say that the Asus Consumer Support needs people like you. Seriously, I contacted them today and they didn't help at all, they even said it probably was a limitation of the motherboard.
You are my new hardware hero :)
Thanks a lot!
 
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DRagor

DRagor

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OMG. They really said this? I guess the guys that work there must be paid no better then garbage collectors in this case.
 
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ivan0590_SPAIN

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I think that is the case because after telling them my problem they said they were looking at the user manual. That gave me a bad feeling xD
And this was in a live chat, they don't pick calls for things like this, they told me.
 
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