The spec page suggests that there are 2 M.2 2280 slots available for pcie SSD storage.
Tom's Hardware states the following:
"Internally, the NUC has three M.2 slots. One is dedicated to an Intel Wireless-AC 8265 card that supports 802.11ax 2x2 and Bluetooth v4.2, while the other two accommodate SSDs (one 2280 and one 2242) in either SATA or NVMe flavors."
So there appears to be a discrepancy.
No, there's no discrepancy; you just don't understand the nomenclature. In the loosest of terms, you can use PCIe and NVMe interchangeably.
To answer your question, yes, you can install two M.2 NVMe SSDs or two M.2 SATA SSDs and create a RAID0 or RAID1 array containing them. The important thing to understand is that you cannot mix interfaces. That is, they both have to be M.2 NVMe SSDs or they both have to be M.2 SATA SSDs; you cannot do it with one M.2 NVMe SSD and one M.2 SATA SSD.
Here, in a nutshell, is the process that you will follow to setup a RAID0 (or RAID1) array on two matching M.2 SSDs:
Hope this helps (reciting from memory, but hopefully accurate),
Hope this helps,
I came across this question and I still wonder if it is possible to have two m.2 ssd installed in a NUC8i7HVK and use the second m.2 ssd for storage or is it only for a RAID configuration?
Yes, you can definitely do that. In fact, that is what I would call the (more-) normal usage model. I bought a smaller but super fast M.2 SSD to be my boot device and then a much larger but much slower (and thus cheaper) M.2 SSD for my data drive. The data drive can be slower because the files are not accessed that often.
The two M.2 Type M connectors can host both NVMe and SATA SSDs, so any combination you would like to use should work. The only thing you need to remember is that, if you do want to use RAID, the valid combinations are NVMe+NVMe or SATA+SATA (i.e. no mixing types).
A pet peeve of mine is that I regularly see cases where folks see symptom A and (somehow) conclude that it is problem B without any analysis or verification of any kind (and they are invariably wrong). A frustration of mine is that (a) I cannot delete these idiot's posts and (b) if I do post a correction, folks don't read down far enough to see this correction and continue to presume that the idiot's conclusion is actually the case (when it isn't).
Off my soapbox now...(sigh!)
Oh, and while I am at it, one more thing: Using RAID 0 with a pair of NVMe SSDs is a complete waste of time. The bandwidth of a single x4 NVMe connection is equivalent to the bandwidth of the DMI bus that connects the processor to the chipset (PCH), so bus saturation will prevent any significant speedup in disk performance. Worse, this same bus supports all SATA, USB, LAN, WLAN, BT, Audio, etc. traffic as well, so this is going to disaffect the RAID 0 performance as well. Using RAID 1 (disk mirroring) is ok, however - but remember that there may be a performance penalty for doing so.