Hi,

>I don't think the motherboard has enough PCIe lanes to natively connect all 
>the drives: the RAID controller effectively functioned as a expander, so you 
>needed less PCIe lanes on the motherboard.
>As the quickest way forward: look for passthrough / single-disk / RAID0 
>options, in that order, in the controller management tools (perccli etc).
>I haven't used the N variant at all, and since it's NVME presented as 
>SCSI/SAS, I don't want to trust the solution of reflashing the controller for 
>IT (passthrough) mode.

Reviewing the diagrams of the system with the H755N and without the H755N it 
looks like the PCIe lanes are limited by the cables they use when you order 
them with these RAID controllers.  (which I guess is why in order to put 16x 
drives in a system you need two controllers). It looks like 

As far as passthrough RAID0 disks, etc I was told that is not a valid 
configuration and wouldn't be supported.

Thanks for the information.
-Drew
 
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