For reference, the current standard is PCIe 5.0 which was introduced in 2019 and has since been adopted by the best motherboards with compliance for DDR5 RAM, meaning far superior ...

Support 16GT 8GT 5GT 2.5GT data rate ; Compliant with PCI Express 4.0, 3.1, 2.1, 1.1 and PIPE 4.2 standards ; x1, x2, x4, x8, x16 lane configuration with bifurcation ; Multi-tap adaptive programmable ...

PCIe x4 and x8 cards can draw up to 25W from the motherboard's slot, while x1 cards are limited to 10W unless configured as a 'full-height' or 'high-power card' to pull the aforementioned 25W.