Thanks!If you read through the specs of the WD SN570 page, it says that the drive is PCIe Gen3 x4 NVMe v1.4, meaning that it'll drop into both the M2_1 slot as well as the M2_2 slot. You'll be good to go but I'd advise on getting a PCIe 4.0x4 drive for M2_1 since the slot has potential for a higher spec'd drive. Also, make sure you're on the latest BIOS version prior to dropping in ram or SSD upgrades.