PCIe NVMe SSD on PCIe slot-Worth it?

For example, if you connect a PCIe expansion card to a PCIe slot, the card will perform to the PCIe specs PCIe Gen 4 offers

PCIe NVMe SSD on PCIe slot-Worth it? PCIe Brand New: Dell $ $ shipping

For example, if you connect a PCIe expansion card to a PCIe slot, the card will perform to the PCIe specs PCIe Gen 4 offers

pcie slot function Biostar ; 1, 1 x AMD Socket AM4 CPU ; 2, 4 x DIMM DDR4-4933+ ; 3, 4 x SATA III Connectors ; 4, 1 x PCIe x4 Slots ; 5, 1 x PCIe x4 Slots

2 NVMe Switch Adapter is a high-performance data transfer solution that allows users to connect up to four NVMe drives to their PCIe x16 slot

pcie 40 gpu in 30 slot slot x1 228022110 NVMe SSD slot x1 228022110 NVMe SSD slot x1 Memory expansion 1* PCIe x16

Question PCIE x8 card into a PCIE x4 slot Im about to build a computer with a Blackmagic Design DeckLink Quad HDMI Recorder Capture