SanDisk SSD x400 M.2 2280 -- SATA or PCIe?

SSD (Solid State Drives) SanDisk X and Z series SSD
2

the x400 is SATA

https://www.sandisk.com/content/dam/sandisk-main/en_us/assets/resources/enterprise/data-sheets/X400-datasheet-v1-1.pdf