are pcie slots backwards compatible - PCIE x1 card in PCIE x16 slot? armada 888 slot

Ever thought: what are small PCIe x1 slots used for? ... PCIe x1 Slots are the smallest of the four PCIe slot standards for motherboards!

For example, a PCIe x8 card could plug into a PCIe x16 slot. However, PCIe bus slots are not backward-compatible with connection interfaces for older bus standards.

Riser Card CRSG01B x 4: - 4 x PCIe x16 (Gen4 x16) FHFL slots, for GPUs · *Compatible with NVIDIA H100 80GB PCIe GPUs at ambient 30°C · Total 3 x PCIe Gen4 low- ...