Official specs from Steam

XCOM 2 system requirements

Minimum and recommended PC specs as listed by the developer on Steam. Native macOS version available. Native Linux build available.

Minimum

OS *Windows® 7, 64-bit
ProcessorIntel Core 2 Duo E4700 2.6 GHz or AMD Phenom 9950 Quad Core 2.6 GHz
Memory4 GB RAM
Graphics1GB ATI Radeon HD 5770, 1GB NVIDIA GeForce GTX 460 or better
DirectXVersion 11
Storage45 GB available space
Sound CardDirectX compatible sound card
Additional NotesInitial installation requires one-time Internet connection for Steam authentication; software installations required (included with the game) include Steam Client, Microsoft Visual C++2012 and 2013 Runtime Libraries and Microsoft DirectX.

Recommended

OS *Windows® 7, 64-bit
Processor3GHz Quad Core
Memory8 GB RAM
Graphics2GB ATI Radeon HD 7970, 2GB NVIDIA GeForce GTX 770 or better
Storage45 GB available space
Sound CardDirectX compatible sound card

macOS minimum

OSmacOS 10.13.6
Processor2.5GHz Intel Core i5 or greater
Memory8 GB RAM
Graphics1GB AMD 5750, Nvidia 650M, 1.5GB Intel Iris Pro 6200 (See Notes for more details)
Storage45 GB available space
Additional NotesThe game is supported on the following Macs. To check your Mac model and when it was released, select About This Mac from the Apple menu on your menu bar. * All 13” MacBook Pros released since Late 2016
Note* All 15” MacBook Pros since early 2011 with a 2.3GHz processor or better
Note* All 17" MacBook Pros since Early 2011
Note* All 21.5” iMacs since late 2013 with a 1GB NVIDIA GeForce GT 750M or better
Note* All 27” iMacs since mid 2010 with a 1GB Graphics Cards and a 2.5GHz processor or better
Note* All 27” iMacs Pro's
Note* All Mac Pros released since Late 2009
NotePlease note for your computer to meet the minimum requirements it must match or better all elements of the listed spec. For more detailed specifications check the Feral website.
Note———

FAQ

What graphics card do I need for XCOM 2?

Minimum: 1GB ATI Radeon HD 5770, 1GB NVIDIA GeForce GTX 460 or better. Recommended: 2GB ATI Radeon HD 7970, 2GB NVIDIA GeForce GTX 770 or better.

How much RAM does XCOM 2 need?

XCOM 2 needs 4 GB RAM at minimum, 8 GB RAM recommended.

How big is XCOM 2?

XCOM 2 requires 45 GB available space.

Does XCOM 2 run on Mac or Steam Deck/Linux?

Yes, there is a native macOS version. A native Linux build is available.