Mari grayscale image looks very bad(faceted)? [SOLVED]

Sunray

I'm still pretty new to Mari and I was wondering why my image looks so bad whatever file type I try jpeg, tiff, Targa, psd, exr they all look terrible and I don't know why? my channel is 32bit float, 8k

Sunray

I got the answer from facebook to solve this problem:  go into your preferences dialog, maneuver to the GPU tab, scroll all the way to the bottom and check if the Virtual Texture Type is set to Byte? if it is set it to half.