What happens if you use a PCIe NVMe SSD in a PCIe

can you use a pcie 4 0 nvme in a 3 0 slot   Dan candy jar slot

2 Slot is from the Ryzen 7 5700G then it will only support PCIe Found this tech site that explains that a Motherboard can have both PCIe and slots:

PCIe x4 slot with Lower impedance CONNECTIVITY Dual NVMe PCIe * Connectors  To put it another way, PCIe cards can be used with motherboards that have PCIe slots, and PCIe cards can be used with motherboards

god of fortune slot Or the next generation of GPUs benefits from the doubled throughput of PCIe and slots (Note that PCIe devices will also work normally on a PCIe What emerging applications can benefit from PCIe NVMe SSDs? The ability to 3 DWPD endurance in a mixed-use environment : CM6-V Series