Valve is doing huge efforts to help the owners of outdated hardware who are still dreaming of a time when they will be able to use their PCs for VR.
The company has developed a plugin, currently working only on Unity engine, which is highly efficient when it comes to image rendering. This plugin is based on the technology created by Valve for its Source Engine 2 and is able to reduce the graphics processing power that is needed to render a coherent game in VR.
The minimum requirements are being reduced to a GeForce GTX 680, instead of a GeForce GTX 970, which is not bad at all.
This success is notable because it gives hope that additional optimizations can be performed on software that will decrease the threshold for VR. DirectX 12 and Vulkan most likely will help, as well as new programming techniques similar to that implemented by the Valve.
Of course, because the new generation of video cards will represent a massive leap in terms of efficiency, and the ones that follow will bring an even more interesting technology, the cost of a PC capable of VR will drop significantly during the next two years.