Space Engineers minimum requirements for Windows assume having at least Microsoft Windows 7 (latest SP) operating system. Your processor should be Intel i5 @ 3.0 GHz or higher (or AMD equivalent) or a more powerful one. The minimum RAM requirement is 8 GB. As for a graphics card, it should be Geforce 750 / Radeon R9 270X or higher, and it should support Direct X Version 11. You also have to have 25 GB free disk space to install the game.
If you go for recommended requirements for Space Engineers for Windows, your operating system should be Microsoft Windows 7 (latest SP). Recommended CPU would be Intel Quad Core i7 @ 4.5 GHz or higher (or AMD equivalent) CPU or equivalent. For RAM, it is recommended to have 16 GB or more. And video card — Geforce 1070 GTX / Radeon RX Vega 56 or higher. It should also support Direct X Version 11.
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You can buy Space Engineers directly on Steam, or on one of the marketplaces below. Usually, games on marketplaces are much cheaper, and you can save up to 80%! Check prices below: