Asus
Gigabyte
MSI
Powercolor
Sapphire
XFX
Group tests
PCI-E Scaling
Looking at the performance data generated by this review I suspect that even at PCIe 4.0 x4 there's a significant performance loss for the RX 6500 XT. My estimate would be around 6-10%, which isn't huge, especially in this segment, but it's still performance that could have been easily be achieved for a minimal cost increase. If the cost difference was substantial, everybody would have slimmed down their PCIe interfaces for a long time.
Averaged over our game test suite, we found a 13% loss in performance when switching from the PCIe 4.0 interface to PCIe 3.0. This will happen to you when running the Radeon RX 6500 XT on an Intel platform that's older than Rocket Lake (10th generation and older). On the AMD side PCIe 3.0 is the fastest option when using first generation Zen processors, or when using lower-end motherboards with cheaper chipsets.
I also ran a full batch of tests for the RX 6500 XT operating at PCI-Express 2.0 mode, which is a fairly unlikely scenario. I doubt there's still PCs used for serious gaming with that bus speed. It's still an interesting data point for science. Here the performance loss is another 21% vs PCIe 3.0, and 34% in total when compared against the PCI-Express 4.0 baseline.
Linux review
Video reviews
Hardware Unboxed
https://www.youtube.com/watch?v=M5_oM3Ow_CI
Gamers Nexus
https://www.youtube.com/watch?v=ZFpuJqx9Qmw
LTT
https://www.youtube.com/watch?v=KYp6pEDm4E8
Hardware Canucks
https://www.youtube.com/watch?v=ArW4-mkGHSw
eTeknix
https://www.youtube.com/watch?v=rpko3K7EoL0
KitGuruTech
https://www.youtube.com/watch?v=DmE8iZWaLWE