rerun119 all the video decoders for rtx cards are the same. So it either comes to performance or to a missing or incorrectly working hevc video extension. Also make sure you use the h265 source not h264 source.
Hevc video extension
- Check if you have the hevc video extension installed on your pc.
- It happens to me from time to time that this extensions stops working even though its installed. To fix this go to add or remove programs. Search for hevc, click the tile than click advanced options. Click Reset than uninstall. After this reinstall in the Microsoft store.
- You can check in your task manager if the decoder of your gpu is doing the work
Performance
If the hevc extension is installed and you still have performance issues it's likely due to supersampeling or a pitool setting. I have a rtx2070 and a pimax 8kx and I can play anything but the VrAllure and Vrhush files with 100% supersampeling at full framerate.
The supersampeling can be set in steam globally but also under the video tab of steam vr settings for each individual app (per-application video settings). So make sure you don't override it there accidentally. If all is correct you should have a resolution of 5058x3160.
Pitool
So make sure you have a profile for deovr/SLR/Heresphere and that these are setup correctly. My settings are:
- FOV large
- render quality 1
- fixed fov rendering close
- compatible with parrell... Close (this one could cause you issues)
- turn on smart smoothing close
- hidden area mask checked
- compatible vive unchecked
FYI, in my experience heresphere is able to handle larger resolutions more smoothly.