The "Fixed" version usually includes an improved enbseries.ini . Ensure VideoMemorySizeMb is set correctly to match your GPU's dedicated memory.
Here is the definitive guide to the system requirements for SA DirectX 3.0 (Fixed). Why the "Fixed" Version? sa directx 30 system requirements fixed
This is a mandatory install. It fixes hundreds of engine bugs that the DirectX mod might otherwise exacerbate. Conclusion The "Fixed" version usually includes an improved enbseries