The PCIe 4.0 IP cores may satisfy the needs for various channel circumstances since it supports both TX and RX equalisation method along with a x4 width physical lane which can also support x1, x2, x4 ...

As long as you accept needing to supply external power with even a low-end GT 1030 card ... used also offered PCIe, the same card was run in a PCIe x4 slot, as well as in an x1 configuration ...

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.

Compliant with PCIe 5.0 / PCIe 4.0 Base Specification, PIPE 5.1, PIPE 4.4 Data rates: 32GT/s (G5), 16.0 GT/s, 8.0 GT/s, 5.0 GT/s, 2.5 GT/s Support physical lane width: x4 Parallel interface ... The ...