I build my NAS with a N3150DC-ITX too.
For the load video in Grub I uncommentet the following to get it working (but slhpss solution seems to be the better one )
/boot/grub/grub.cfg
> load_video {
> #insmod vbe
> #insmod vga
> #insmod video_bochs
> insmod video_cirrus
> }
I had network freezes too, which were solved using the backport kernel.
As far as I found, the mPcie cannot be used for SATAs or if its possible they are very slow. (see eg. http://superuser.com/questions…msata-interfaces-and-ssds)
Next thing to try for me is using the PCIe x2 for additional SATA Ports:
http://www.amazon.de/PCI-Expre…sr=8-1&keywords=pcie+sata