To run Metro 4 on high graphics settings your PC will require at least a 8GB GeForce GTX 1080 Ti / Radeon RX Vega 64 Air 8GB with a Core i7-8700K 6-Core 3.7GHz or Ryzen 7 2700 8-Core 3.2GHz CPU. Metro 4 needs a Radeon HD 7870 graphics card to play on low settings, with a Core i5-4440 3.1GHz or FX-8370E processor to reach the minimum specs, achieving 30FPS on 1080p monitor res. To be able to run at all you will need at least 8 GB system memory. Your graphics card will need to be capable of running DirectX 12. To summarise, Metro 4 needs around a 4 year old PC to play at recommended settings.