SteamVR Poly Count Limit?

Hi,
I have searched for Poly count limit for SteamVR and nothing came up. I would like to know from the Dev community and from Epic what are the recommended ploy limits in SteamVR. I see there is a limit for mobile VR but not for SteamVR. I am aiming for GTX 970 for my bench mark.

I’d also be really interested to hear any insights from Epic on recommended art budgets for VR