Granted the fact that Half-Life 2: Aftermath is powered by same game engine that Half-Life 2 itself is based on (the Source engine), the system requirements will probably be identical. With that said, if you are able to run Half-Life 2 decently at an excellent resolution (1024x768-1600x1200) with all whistles and bells enabled (model detail, texture detail, anti-aliasing, texture filtering, water detail, shadow detail, shader detail, hardware/software DirectX level, and etc all set to high...) you'll probably have no trouble running nor maintaining a reasonable frame-rate in Half-Life 2: Aftermath at those same precise configured settings. And just for reference and your own convinience, the minimum and recommended system requirements of Half-Life 2 are:
Minimum system requirements:
Windows 98/98se/2000/Me/XP
1.2GHz level CPU(E.G, Pentium III/Pentium 4, T-Bird/Athlon XP processors)
256MB of RAM
32MB-64MB VRAM Direct-X 7 level graphics card(E.G, GeForce 1/2/4 MX series, Radeon 7xxx series)
~3 GB free HDD space
Mouse and Keyboard
Internet Connection
Recommended system requirements:
Windows 2000/XP
2.4 GHz level CPU(I.E, Pentium 4/Prescott, Athlon XP/64 processors)
512MB of RAM
128MB-256MB VRAM DX9 compatible video card(I.E, Radeon 9800/X800 series, GeForce 6/6800 series)
~4 GB free HDD space
Mouse and Keyboard
Internet Connection
