I have a asus rog crosshair V formulaWhat motherboard do you have?
You can buy a PCIe to M.2 Adapter such as this (there are others) https://www.amazon.com/ASUS-M-2-X16-V2-Threadripper/dp/B07NQBQB6Z/ and then you need to buy a PCIe3.0 Speed NVMe M.2 Drive such as the Crucial P1, Intel 660P, Samsung 970