From owner-freebsd-questions@freebsd.org  Wed Oct 14 19:52:36 2015
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Date: Wed, 14 Oct 2015 13:52:33 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Rob Rati <lists@midsummerdream.org>
cc: freebsd-questions@freebsd.org
Subject: Re: PCI-E SSD cards
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On Wed, 14 Oct 2015, Rob Rati wrote:

> On a technical point, there are a lot of these ssd cards in the m.2 
> form factor.  Using that form factor would allow me to use multiple 
> ssd cards and get some zil mirroring for resiliency.  What I haven't 
> been able to tell is what type of slot accepts an m.2 form factor 
> card.  I know there is the sata-to-sata vs pcie-to-pcie type issue, 
> but everything I have found seems to imply that the m.2 form factor 
> card would fit into a pci-e 1x-16x slot.  Is that correct?  Does it 
> matter how new the MB is if it has pci-e slots?

M.2 can have several kinds of interfaces, including PCIE.  It is a much 
smaller connector than a normal motherboard PCIE slot, though.  Some 
newer motherboards include an M.2 connector.  There are adapter cards 
that plug into a PCIE slot and have an M.2 connector on them.

https://en.wikipedia.org/wiki/M.2