Oh thank you!
It is just my regular development PC that I dragged over to our Twitch streaming room. It’s a 6-core Intel Core i7 3.4 GHz (almost 2 years old) with a single NVIDIA GTX 980, hyperthreading enabled.
As with anything VR-related, your performance depends heavily on the content. In our demo level we used assets from the new Unreal Tournament mixed with objects from the freely available Infinity Blade content pack on the marketplace. We just sort of scrounged up cool stuff that anyone has access to. Almost all rendering features were enabled except for motion blur (looks bad in VR) and image-based lens flares. We had some performance to spare so we left screen-space reflections turned on.