Should you buy a PCIe or SSD?

For instance, a x16 slot with only 4 PCIe lanes is quite common Computer bus interfaces provided through the connector are PCI Express

I had an Asus HYPER X16 GEN 4 CARD for 4 Nvme but it's OK for only one slot I should change to x4x4x4x4 in my bios Another idea was to

m2 sata vs nvme slot Eight NVMe SSD slots on a PCIe x16 card 2 8x4 Silent Gen4 PCIe card with your SSDs into your computer's x16 PCIe slot to achieve outstanding

m2_1 slot Part 2: Install the SSD · Locate the PCIe slot · Insert the SSD Depending on your computer, there might be a heat sink or screw that needs to be removed prior