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post #1 of 5 (permalink) Old 09-28-2019, 12:01 AM - Thread Starter
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How M2 Get/Share Bandwidth Z390 Dark

I have a Z390 Dark with a 9900K. The board has two M2 slots. I currently have one occupied but I wanted to install another M2 drive in the other slot. I am a little confused about how M2 slots get their bandwidth. I know that they're a PCI-e x4 interface, but do they get their PCI-e lanes from the chipset or are they getting them from the CPU? I am running two RTX 2080 Ti's so I can't afford to lose any PCI-e lanes. Basically what I'm asking is can I run two M2 SSD's, one in each slot, with SLI 2080 Ti's on a 9900K on a z390 Dark and have everything function correctly?

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post #2 of 5 (permalink) Old 09-28-2019, 02:39 AM
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Quote: Originally Posted by cerealkeller View Post
I have a Z390 Dark with a 9900K. The board has two M2 slots. I currently have one occupied but I wanted to install another M2 drive in the other slot. I am a little confused about how M2 slots get their bandwidth. I know that they're a PCI-e x4 interface, but do they get their PCI-e lanes from the chipset or are they getting them from the CPU? I am running two RTX 2080 Ti's so I can't afford to lose any PCI-e lanes. Basically what I'm asking is can I run two M2 SSD's, one in each slot, with SLI 2080 Ti's on a 9900K on a z390 Dark and have everything function correctly?
You don't have any PCI-e lanes left anyways. With both cards at 8x you're already using all 16 lanes. The M2 slots should use the PCH lanes so you should be able use one more.

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post #3 of 5 (permalink) Old 09-28-2019, 01:23 PM
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From the manual they are both x4 from the PCH, the top one shares with the U.2 port and the bottom one shares with the x4 slot.

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post #4 of 5 (permalink) Old 09-29-2019, 05:54 AM - Thread Starter
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How M2 Get/Share Bandwidth Z390 Dark

Quote: Originally Posted by D-EJ915 View Post
From the manual they are both x4 from the PCH, the top one shares with the U.2 port and the bottom one shares with the x4 slot.


I checked out the manual, but must have missed that. I’ve read it before, but it wasn’t an issue until now. Thanks.
It’s cheaper and easier to expand my storage by adding another m2 SSD, rather than replacing my current one with a higher capacity drive and also having to reinstall Windows. It’s just unfortunate that, for now, the faster drive will be the secondary storage drive. Next time I do a reinstall on Windows I’ll switch, assuming it actually benchmarks faster than my 960 Evo.


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Last edited by cerealkeller; 09-29-2019 at 05:59 AM.
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post #5 of 5 (permalink) Old 10-04-2019, 03:13 PM - Thread Starter
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How M2 Get/Share Bandwidth Z390 Dark

I got everything sorted out, yeah, it works just fine


Last edited by cerealkeller; 10-04-2019 at 04:05 PM.
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