Groom - strands aren't rendering

We’re using Grooms on a character, but we’re getting very inconsistent results. It renders fine on my machine, but others are saying they cannot see the strands. Lower LOD’s where it switches to cards do seem visible.

What is the minimum GPU specs for strands?

How can I set the grooms to render at lower LOD’s for low-end PC’s. I know I can set it per platform, but WinPC is one platform, how do I switch based on the PC’s GPU?