1 x M.2 slot (Key E) for an Intel® CNVi wireless module only
Most x8 HBAs can go in an x16 physical slot. Many boards do not have x8 physical slots and have some combination of x16, x4 and x1.
Depending on what you plan to attach to the HBA, x4 may be enough anyway. HDDs rarely need more than 200 MB/s. x4 in PCIe 3.0 provides 4 GB/s bandwidth (really closer to 3 GB/s by the time you factor in overhead.) Let's just say 3.2 GB/s to make the math easy. If the HBA supports 8 drives, that is 400 MB/s per HDD even with x4. You don't want to connect SSDs to HBAs because most (with a few exceptions) don't support TRIM properly. If you were connecting 8 SDDs to the HBA, they would likely be bandwidth constrained, but you don't want to do that.
I have my x8 HBA in an x16 slot on my MB. My HBA is only PCI 2.0 (half the bandwidth of PCIe 3.0) but even with 8 drives attached, it would provide enough bandwidth as they only get up to 200 MB/s in rare cases.
To be honest. I totally agreed your opinion. It's quite helpful for me as well as other too. Overall, Z390 is an extremely powerful motherboard.
Will z390 (or 370) chipset support a PCIE-3.0 x8 SAS controller/HBA?
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To be honest. I totally agreed your opinion. It's quite helpful for me as well as other too. Overall, Z390 is an extremely powerful motherboard.