Official specs from Steam

Doom Eternal system requirements

Minimum and recommended PC specs as listed by the developer on Steam.

Minimum

NoteRequires a 64-bit processor and operating system
OS *64-bit Windows 7 / 64-Bit Windows 10
ProcessorIntel Core i5 @ 3.3 GHz or better, or AMD Ryzen 3 @ 3.1 GHz or better
Memory8 GB RAM
GraphicsNVIDIA GeForce GTX 1050Ti (4GB), GTX 1060 (3GB), GTX 1650 (4GB) or AMD Radeon R9 280(3GB), AMD Radeon R9 290 (4GB), RX 470 (4GB)
NetworkBroadband Internet connection
Storage80 GB available space
Additional Notes( 1080p / 60 FPS / Low Quality Settings )

Recommended

NoteRequires a 64-bit processor and operating system
OS64-bit Windows 10
ProcessorIntel Core i7-6700K or better, or AMD Ryzen 7 1800X or better
Memory8 GB RAM
GraphicsNVIDIA GeForce GTX 1060 (6GB), NVIDIA GeForce 970 (4GB), AMD RX 480 (8GB)
NetworkBroadband Internet connection
Storage80 GB available space
Additional Notes( 1080p / 60 FPS / High Quality Settings ) - *On NVIDIA GTX 970 cards Texture Quality should be set to Medium

FAQ

What graphics card do I need for Doom Eternal?

Minimum: NVIDIA GeForce GTX 1050Ti (4GB), GTX 1060 (3GB), GTX 1650 (4GB) or AMD Radeon R9 280(3GB), AMD Radeon R9 290 (4GB), RX 470 (4GB). Recommended: NVIDIA GeForce GTX 1060 (6GB), NVIDIA GeForce 970 (4GB), AMD RX 480 (8GB).

How much RAM does Doom Eternal need?

Doom Eternal needs 8 GB RAM at minimum, 8 GB RAM recommended.

How big is Doom Eternal?

Doom Eternal requires 80 GB available space.

Does Doom Eternal run on Mac or Steam Deck/Linux?

There is no native macOS version. There is no native Linux build (Proton compatibility may vary).