Here are the Oblivion Override System Requirements (Minimum)
CPU: Intel i5+
RAM: 2 GB
VIDEO CARD: 1GB VRAM/DirectX 10+ support
DEDICATED VIDEO RAM: 1 GB
PIXEL SHADER: 4.0
VERTEX SHADER: 4.0
OS: Windows 7+
FREE DISK SPACE: 4 GB
Oblivion Override Recommended Requirements
CPU: Intel i5+
RAM: 4 GB
VIDEO CARD: 2GB VRAM/DirectX 11+ support
DEDICATED VIDEO RAM: 2 GB
PIXEL SHADER: 5.0
VERTEX SHADER: 5.0
OS: Windows 10+
FREE DISK SPACE: 4 GB