Rust minimum requirements for Windows assume having at least Windows 8.1 64bit operating system. Your processor should be Intel Core i7-3770 / AMD FX-9590 or a more powerful one. The minimum RAM requirement is 10 GB. As for a graphics card, it should be GTX 670 2GB / AMD R9 280 better, and it should support Direct X Version 11. You also have to have 20 GB free disk space to install the game.
If you go for recommended requirements for Rust for Windows, your operating system should be Windows 10 64bit. Recommended CPU would be Intel Core i7-4690K / AMD Ryzen 5 1600 CPU or equivalent. For RAM, it is recommended to have 16 GB or more. And video card — GTX 980 / AMD R9 Fury. It should also support Direct X Version 12.