How can I check the NVME specs

I have the exact same board and the same SSD and it doesn't work in the M2_2 slot for me either I have 2 NVME SSDs (P3 and Cheap Chinese

2 slot For slots intended to be used with NVME SSDs, you see M-keying, that makes 4 lanes of PCIe available The so-called 'WiFi slots' on

which interview slot is best The top slot which my older gen 3 drive is in is the one that has dedicated PCIE lanes direct to the CPU from the NVME slot though and is the

which slot I know the slot closest to the processor is the faster one but which SSD should go there