Here are the Below the Stone System Requirements (Minimum)
CPU: Intel Core 2 Duo E6320 (2*1866) or equivalent
RAM: 4 GB
VIDEO CARD: GeForce 7600 GS (512 MB) or equivalent
DEDICATED VIDEO RAM: 512 MB
PIXEL SHADER: 3.0
VERTEX SHADER: 3.0
OS: Windows 7 or later
FREE DISK SPACE: 500 MB