installing Gen4 NVME on a Gen3 Motherboard

Solved: Does installing gen4 NVMe SSD on PCIe 3 slot affect the speed? or should i buy 3 gen3 NVMe ssd? Please give me some advice

2 slots I'm looking to add 2 pcie gen 4 nvme SSDs I assume one drive will use one of the x16 lanes And the graphics card

nvme m2 ssd slot For example I have two SSD bays the first one supports Gen 3 x 4 speeds the second one only supports Gen 3 x 2 speeds because there are a

nvme m2 slot Combined chipset and processor IO with a 3rd Gen AMD Ryzen™ or newer processor A-Series processors for socket AM4 feature 1x2 NVMePCI 'Usable PCIe Lanes'