Looking for PCIE 8x GPUs

When I was on a low end Ryzen, I used a mining riser plugged into an x1 slot covered by the GPU Then plugged another GPU into that riser, just

Scalable parallel computing GPU dense servers that are built for high performance 2 GPU 4 GPU 8 GPU EZ-Latch：PCIe x16 Slot with Quick Release Design; Fast

what is slot When I was on a low end Ryzen, I used a mining riser plugged into an x1 slot covered by the GPU Then plugged another GPU into that riser, just

what is a dual slot gpu The total bandwidth of an expansion slot depends on both the number of lanes and the PCI-e version, such that a PCI-e connection with eight