PCI card in PCIe Slot?

Buy Turn 2x Full-Height PCIe Slots into 2x 40mm Fans Improve GPU Airflow Universal for PC Cases, Server Chassis and 40mm Fans

The number after the x tells you how many lanes that PCIe slot has A PCIe x1 slot has one lane and

pciex1_1 slot The Matrox C680 full-height, PCIe x16 video card supports up to six displays or projectors with a maximum resolution of 4096 x 2160 C900 PCIe x16 graphic card

pcie x32 slot 1x Full-height Universal IO Expansion Slot 1x A full-height UIO, a full-height PCIe, and a low-profile PCIe