Sony's PSVR system goes on sale Thursday, completing the consumer virtual-reality triad of 2016. Of course, where the Oculus Rift and HTC Vive draw on the processing power of a high-end PC, the PSVR runs on Sony's PlayStation 4—more than 40 million of which have sold since the game console's launch three years ago. That's a big pool of purchase potential, and while a PS4 can't provide the same high-octane boost as a high-end desktop computer, the PSVR's $399 price might be enough to make people overlook the incremental performance hit.