what is a pcie x1 slot good for?

Dual NICs on PCIE x1 slot recommendation pciex1 slot Anything A pcie 4 x1 slot is a whole lot of bandwidth and could be used for any pcie card with minimal real world bottleneck GPUs would be pciex1 slot NVMe PCIe® x4 & PCIe® x2 • 1x PCIe ® Slot 2 2280 • NVMe PCIe x4 and SATA Mode 12 Smart Fan 5 + FAN STOP • 3 Fan

pciex16 slot configuration I cut open the back of a x1 slot on my motherboard to allow me to fit a full size GPU