The PCIe riser supplied in the housing is a PCIe 4.0 x16 riser. It therefore supports PCIe 4.0, not PCIe 5.0.

However, according to the manufacturer, the existing PCIe 4.0 riser cables in the Y70, Y60 and Y40 cases are fully compatible with the RTX 50-series GPUs that use PCIe 5.0 and can operate them at full PCIe 5.0 x16 speed, even though the riser itself is PCIe 4.0.