Will new RTX 3080ti cards require a PCIe 4.0 slot to work? - Video ...
Will a PCIe 2.0 work in a PCIe 3.0 slot? ... It'll surely be a bottleneck if you're using a PCIe 3.0 or 4.0 card in a PCIe 2.0 slot.
PCIe 3.0 GPU in a PCIe 4.0 Slot - Graphics Cards
With most new expansion cards coordinating with v3.0, it is common to ask: can I use a PCIe 3.0 card in a 2.0 slot?
Colorful Debuts iGame Duo SSD: GPU with Two M.2 Drives | TechPowerUp
The Crucial P3 provides good performance in a PCI Express 3.0 NVMe SSD ... You can have this PCI Express 3.0 NVMe stick for a song—and it won't have you singing the blues.