My previous post is definitely correct in this regard, I don't know what all the other companies offer but if you have a PCIex4 M.2 in slot no.1 then it disables the M.2 slot no.2. This is why we have the text in the product overview that was quoted previously and also why we have both PCIe and SATA drives as an option in M.2 slot 1 but only SATA and LTE options in M.2 slot 2.
I had a conversation with the Clevo engineering team about this specific point in November 2015, the best way for me to illustrate my point would be for me to post the diagrams that they sent through to illustrate why this is, but these diagrams are internal Clevo material and don't appear in the user or service manual so I can't post them here for now. I have asked Clevo if they mind me posting it here - if they say yes I'll follow this up as it seems some other companies may not be aware of this information.
I would say that the spec pdfs and even the user manual do all say 2x M.2 SATA RAID 0/1 OR 1x PCIe x4. It doesn't explicitly say that you can't run (M.2) 1x PCIe x4 and 1x SATA III, but it came up in our pre-production testing and it should really be common knowledge (I think I've discussed this on nbr before but sure it's been lost in the millions of posts!!!).
There is no factory option to change the functionality explained below.
[ HSIO stands for high-speed input-output ] This is how the HSIO Multiplexing is arranged in the PCH-H:
Intel HM170 chipset supports 4x SATA, these HSIOs equate to SATA #0, 1, 2 and 3.
SATA 2 and 3 are used by the HDDs.
The other two SATA channels are assigned to the two M.2 ports (one to each of course)
Two of the four PCIe HSIOs overlap the two SATA channels which are assigned to the two M.2 slots.
When you install a PCIe x4 drive into M.2 slot 1, these two overlapped HSIOs switch from SATA #0 and 1 to PCIe 9 and 10 - this switching does exactly that, it doesn't only disable SATA #0 but also SATA #1 which is why it's then not possible to run a SATA M.2 in the second slot if you have PCIe x4 in the first M.2 slot.
If Clevo let me share their diagram I will update this post, but I hope the above text explains it clearly enough.
Now if you want to run a PCIe x4 drive in M.1 slot 1 and a UMTS/LTE module in M.2 slot 2, this is possible because the LTE modules run off the USB bus and not the SATA ;-)
Click to expand...
Problems? See this thread at archive.org.
