Here are the Portal: Revolution System Requirements (Minimum)
CPU: Intel i3-8300 or similar AMD CPU
RAM: 8 GB
VIDEO CARD: NVIDIA GeForce GTX 750 or similar AMD GPU
DEDICATED VIDEO RAM: 1024 MB
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 10/11
FREE DISK SPACE: 12 GB