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At the just-concluded VRX conference, Nvidia general manager Zvi Greenstein reported that there are already 15 million VR Ready PCs installed with the company's GeForce graphics card. He predicted that the number will increase from the end of last year. 30%. 
It should be noted that 15 million units are not the number of all VR PCs. After all, some PCs have AMD graphics cards installed. The VR experience offered by Oculus Rift and HTC Vive may be better than PlayStaTIon VR, but the latter is selling more on the market, at least in the short term.
Despite this, Nvidia's figures far exceed Sony's, because PlayStaTIon 4 only sold 5 million units. Sony's figures include standard and Slim versions, the Slim version has just been released for a few months, and the PlayStaTIon 4 Pro, which is even more powerful. PS VR can be supported regardless of the version. 
Oculus, HTC and Sony did not disclose the sales of helmets. Compared to the PC helmet, the Sony helmet has a weaker tracking function and lacks some other features, but it is cheaper. The PS VR is priced at $399, the Rift is priced at $599, and the HTC Vive is priced at $799. Overall, Sony has an advantage in the short term, and soon HTC and Oculus will lower the price of helmets and supporting PCs.
At this year's Oculus Connect 3 conference, Oculus announced the Rift's minimum configuration requirements, and low-end cheap PCs can also support helmets. I believe that with the help of major manufacturers, it will not take long for VR to enter every ordinary family.
2016 is regarded as the first year of VR. The experience of VR as a “virtual reality†is indeed very scientific and technological. I believe that everyone who has experienced it has a deep understanding. NVIDIA's latest "10 Series" graphics card is also labeled "VR Ready", which also indicates that NVIDIA has provided a basis for VR at the hardware level.
Fight the future! 15 million VR PCs installed GeForce graphics card