pcie 3x2

Hey All, I currently own an Asus ROG Zephrus GA502D. There are two PCIe Gen 3x2 slots in the mother board. One is currently filled with the factory SSD but I'm looking to expand the storage and add a 500gb m.2 SSD. Im shopping around on PC part picker and seems one of the better deals is the...

I just realized that I haven't actually know my laptop's m.2 support. By having an intention to buy XPG SX8200 Pro, I forgot to check my m.2 slot support 3x2 or 3x4. As, I did found some results that if the 'key' is M and it would be PCIE 3x4...