Upfrade from SSD Raid to M.2 Raid

I currently have a Gigabyte Z97MX-Gaming5 Mobo with 3x 850 250GB Samsung EVO in Raid0. I am upgrading to Gigabyte GA-Z170X-Gaming5. The questions are the following:
1) If I install 2x Samsung SM951 M.2 PCIe 3.0 x4 SSD modules will they work together in RAID0?
2) How many SATA ports do I lose? (Gigabyte has something about this in the manual but I cannot work it out)
3) What speed increases can be expected?

Thanx in advance.

SSD_Raid.jpg


Edit: Note to self …playing with drivers/oroms can cause windows not to boot…reloading now…grrrrrr

You may be able to create a "Software RAID" by the Windows OS, but no real RAID0 array. AFAIK there is no RAID Controller available for Samsung’s M.2 SSDs. They only support the AHCI resp. NVMe mode.

So neither the Samsung SM951 AHCI or NVMe types will work in real RAID0? Are there any M.2 PCIe 3.0 x4 modules that can do RAID0?
Confused now. On page 31 and 32 of the manual for the GA-Z170X-Gaming7 mobo it states that a raid can be set up in UEFI. I do not
want to spend any money before I know that I can setup Raid0 with 2x M.2. Am I reading the manual wrong? Link to manual:
http://download.gigabyte.ru/manual/mb_ma…x-gaming7_e.pdf
After some googling actually found this:
http://www.thessdreview.com/our-reviews/…onsumer-option/

Yes, you can create a RAID0 array from within the UEFI BIOS, but the drives have to be connected to the Intel SATA ports.