Noticeable differences in path-traced hair strand look on the exact same UE 5.8 project depending on the GPU (RTX 4090 vs. 50 Series)

[aengjung]

Hello,

I am currently working on rendering custom MetaHuman-based grooms in a Path Tracing environment in Unreal Engine 5.8.

I’m reaching out because I’ve encountered a strange issue. I copied the exact same project file and opened it with the exact same settings, yet the final rendered look of the hair strands is noticeably different depending on the graphics card installed (RTX 4090 environment vs. RTX 50 Series environment).

rtx4090 hair strand look

rtx5080 hair strand look