slots on ASUS z790…has 3… all are PCIe is one “faster”?

It features five M 2 SSD slots with heatsinks, USB Gen 2x2 support, WiFi 6E, AI Overclocking, AI Cooling II, AI Networking, Two-Way AI

2 slots I'm looking to add 2 pcie gen 4 nvme SSDs I assume one drive will use one of the x16 lanes And the graphics card

2xbet slot ONLY work with NVME or PCIe based drives and not the older SATA based SSD

2x m2 ssd slot nvme pcie gen4 is a slot that can interface with SATA , PCI Express