I'm sorry that one has to scroll down to the award description to find the "Read Review" link, but the first board on the list links to a review, with a table, that starts off with:The latest reviews I saw list the # of NVMe supported... M.2 is NVMe, no? (that's M-key... chips up, contacts facing away from you, M-key slot is on the right; B-key slot is on the left. Of course, B+M is SATA, not NVMe... and SATA B+M drive won't fit in NVMe socket.)
Specifications
Socket | LGA 1151 |
Chipset | Intel Z390 |
Form Factor | ATX |
Voltage Regulator | 13 Phases |
Video Ports | HDMI 1.4, (2) Thunderbolt (DP 1.4, 1.2) |
USB Ports | 10 Gbps: (2) Type-C (via Thunderbolt), (2) Type A5Gb/s: (4) Type A; (2) USB 2.0 |
Network Jacks | (2) Gigabit Ethernet (1x PCIe share), (2) Wi-Fi Antenna |
Audio Jacks | (5) Analog, (1) Digital Out |
Legacy Ports/Jacks | (1) PS/2 |
Other Ports/Jack | DisplayPort In (for Thunderbolt passthrough) |
PCIe x16 | (3) v3.0 ( x16/x0/x4, x8/x8/x4, x8/x4/x4) (*4-lane slot switchable from PCH to CPU) |
PCIe x8 | ✗ |
PCIe x4 | ✗ |
PCIe x1 | (2) v3.0 |
CrossFire/SLI | 3x / 2x |
DIMM slots | (4) DDR4 |
M.2 slots | (2) PCIe 3.0 x4^ / SATA* (^Excludes ports 4-5, 0 : *4-5, 1) |
^ when you use the PCIe interface on the first M.2 slot, it shuts off SATA ports 4 and 5
^when you use the PCIe interface on the second M.2 slot, it shuts off SATA port 0
*when you use the SATA interface on the first M.2 slot, it shuts off SATA ports 4 and 5
*when you use the SATA interface on the second M.2 slot, it shuts off SATA port 1
Of course that's a Z390 chipset, which is typically limited by the HSIO resource that can feed either an SATA port OR a PCIe pathway. The only reason for a single SATA interface on M.2 to steal two SATA ports is that the same 2-lane automatic switch is being used to direct HSIO regardless of whether its using SATA or PCIe transfer modes.