PCIe Gen 4 vs Gen 3 Slots, Speeds

Chipset slots and Gen4 NVMe, am I really bottlenecked? nvme 4 0 in 3 0 slot ASUS Hyper x16 Gen 4 Card supports four NVMe devices up to 256 Gbps for AMD TRX40X570 PCIe NVMe RAID and nvme m2 slot Da kann Slot 1 PCIe und und Slot 2 nur PCIe PCIe Nvme SSD wie anbinden?

nvme m2 slot NVME Adapter PCI-E x1 to NVMe M Key Slot Converter US $ 43 sold 5 JEYI NVME to PCIe SSD Adapter, 64Gbps PCIe X4 X8 X16