PUBG's previous configuration has changed a bit since the previously proposed Intel Core i3-4340 is dual-core processor from 2013 with 3.6GHz clock. PUBG can completely run on a lower-end CPU and has no 4 cores, giving only minimal performance.
But PC Gamer's detailed performance analysis shows that PUBG may be limited to CPU so the minimum requirement is that Intel Core i5-4430 will be more reasonable. GTX 660 card was released in 2012 compared to the current GTX960, you will have to be very difficult to achieve 30fps.
Everyone has to admit that a minimal configuration, the game experience will lose the interesting part, PUBG is no exception. Below is a configuration that helps you have a complete experience in PUBG.
Operating system: Windows 10 64 bit
CPU: Intel Core i5-7600K / AMD Ryzen 5-1600
RAM memory: 8 GB RAM
Graphics Card: Nvidia GTX 1060 6GB or higher
DirectX: Version 11
Internet: Broadband Internet connection
Hard drive capacity: 30GB of free space
If you just need to play the game, for processors like AMD Ryzen 5 or Intel Core i5, or for Core i3-8100 or Ryzen 3 1300X 4 cores / 4 threads, the game runs well. If you need some more activities like live stream, you need more cores.
One thing to note is that dual-core CPUs such as Celeron / Pentium and Core i3 will likely encounter many problems when playing. The lowest frames will appear at the most important moment of the game. So for dual-core CPUs you will encounter more disadvantages than with 4-core CPUs.
With the graphics card, you will need 3GB GTX 1060 strong enough to run PUBG an average of 60fps with Ultra Settings, if the drop is only the lowest of 40fps, and if Medium Settings, the lowest level will always be higher than 60fps. AMD's GPUs are also good, although a bit old if compared to Nvidia's price models and all versions of PUBG are more suitable for Nvidia, but the retail releases with the latest drivers show that RX 570/580 and major Vega cards are on par with GTX 1060/1070/1070 Ti.