What does the X4 mean in an PCIe Gen X4 NVME drive?

Am i bottle necking Running PCIE with 3080 TI? pcie 3 slot First of all, I know that a PCIe 4 SSD NVMe will be running at gen 3 speeds and bottlenecked by the PCIe 3 slot But I'm wondering if there are pcie 40 in 30 slot PCIe 's throughput is 1GB per second per lane, providing an overall data transfer rate or bandwidth of up to 32GBs total PCIe doubles

pcie m2 slot  PCIe x16 5 x PCIe x16 4 x PCIe x16 3 x PCIe x16 Power Phase, Chipset, Memory, Slots, Multi-GPU, Graphics, Audio, Network