This table gives a quick overview of the rough transfer speeds of common high-speed links:

Gbit/s Additional information
USB2 0.48
USB3 Gen1 x1 5
SATA 3 6
PCIe Gen3 x1 8
DisplayPort HBR 8.6 1920 × 1080 @ 120 Hz 10bit
USB3 Gen2 x1 10
PCIe Gen4 x1 16
USB3 Gen2 x2 20
DisplayPort HBR3 26 3840 × 2160 @ 120 Hz 8bit
PCIe Gen5 x1 32
PCIe Gen3 x4 32
USB4 PCIe tunneling 32 = PCIe Gen3 x4
USB4 Gen3 x2 40 = Thunderbolt 3
PCIe Gen4 x4 64 AM5 motherboard chipset
PCIe Gen5 x4 120
DDR4 3200 MT/s 204
PCIe Gen5 x16 504
DDR5 8200 MT/s 960
Sources: