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PCs are expensive, especially if you wish to run VR. Lowest price you can expect to pay is $699 for a "good enough" PC
Most recently, Sony revealed it had sold an impressive 35.9 million PS4's. Which means over 35 million people are ready to play VR once PSVR is released. 

In between the people who may purchase the PS4 and those who may buy/build a new PC we have those who may like the PS4 Pro. The PS4 Pro is more powerful than the regular PS4 in the graphics department. Making it capable of running games in 4K and of course in VR. The new PS4 Pro boasts 4.2 TFLOPS of GPU power vs. the original PS4 of 1.84 TFLOPS. The Nvidia GTX 970 comes in around 4 TFLOPS. Is this a coincidence? I think not, remember the Nvidia GTX 970 was the recommended minimum by Oculus when the Rift was first released.

Technical Specification for PS4 Pro

CPUCustom x86-64 AMD Januar 8 Cores
MemoryGDDR5 8GB
Hard Drive1TB
External Dimensions295mm x 55mm x 327mm (Width x Height x Depth)
Mass3,3 kg
Optical DriveBlu-Ray 6 speed
DVD 8 speed
Input and outputSuper-Speed USB 3.1 & 3.0
IEEE 802.11 A / B / G / N / Ac
Power SupplyAC 100V, 50 / 60 Hz
PowerUp To 310W
Optical Out

When is PS4 Pro Coming and how much?

Sony has said the PS4 Pro would arrive on November 10 with a price of $399, which is very close to the current price of the original PlayStation 4. The company will launch the PSVR HMD on October 13 just one month earlier.