PC doesnt boots when 2x gen 4 NVME ssd are installed

On my Asus x570 C8H, I can set each PCIe slot, each slot and the south bridge link to either Gen 3 or Gen 4 independently I'm currently

This drive installs into an available 2280 PCIe x4 slot Advanced features such as dynamic write acceleration, error correction code , TRIM support

cannon cove slot NVMe SSDs, unlike HDDs, do not store data in mechanical parts NVMe Drives can use 4 PCIe lanes, which means a theoretical maximum

can slot machines be rigged , pronounced m dot two and formerly known as the Next Generation Form Factor , is a specification for internally mounted computer expansion cards