Thats not a GPU problem. Thats a DepthBias error.
[EFFECT]
EnableBloom=0
EnableOcclusion=1
EnableReflection=0
EnableMotionBlur=0
EnableWater=0
EnableShadow=0
DepthBias=0
EnableDepthOfField=0
EnableReflectiveBump=0
You should have DepthBias=0 in all your enbseries.ini presets. And thats it 🙂