Which is faster an slot or PCI-E slots for an drive?

How to make NVMe SSD run at PCIe x4?? 2x m 2 ssd slot nvme pcie gen4 An NVMe SSD is more or less a PCIe card, so you don't need an HBA You only need a simple card that connects the SSDs to the PCIe slot and @ 2x m2 ssd slot nvme pcie gen4 2 devices are much faster than SATA devices

2xl slot Crucial P3 Plus 1TB NVMe Internal SSD 2280 - PCIe - up to 5,000MBs Read - up to 3,600MBs Write