Phison's new PCIe 4.0 x4 SSD controller is so bleeding edge that the company doesn't have a motherboard (that it can show publicly) that supports the faster standard.
Do you know any mainboards that support PCIe 4.0? The one I bought recently only does PCIe 3.0.
So, wondering if there is any commercially available product in market and does FreeBSD has any support for it?