Question MSI z390-a pro 2nd PCI-E 16x runs only with 2x

Apr 15, 2021
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I put a PCI-E 4x NVMe adapter into my 2nd 16x slot. The manual states that this shoul have 4 PCH lanes. The problem is that it only runs with 2x and thus the ssd speed is below 2000MB/s (should be 3500).
I already tried to pull out all SATA drives (don't know if lanes interfer there) - with no avail.

So is there a way to enable 4x on my 2nd 16x slot?
 
was looking at your mainboard manuals and couldnt find a thing why wouldnt it run in x4 mode
so i looked through similar boards from msi and some of them mention this:
PCI_E4 slot will become PCIe x2 mode, when installing device in any PCIe x1 slot.
can u confirm if thats your case?
 
Apr 15, 2021
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i updated bios and tried magician all with no avail- i also opened a ticked at msi support - will report back here if it yields something.
Thanks anyway :)
 

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