The "PCSX4" project is a long-standing hoax. Real emulation projects are typically open-source and hosted on platforms like GitHub; PCSX4 uses a polished, professional-looking website to trick users into downloading "installers" that require "verification keys" obtained through malicious links.
If an emulator doesn't have a public GitHub repository with active code contributions, it is likely fake. Download PS4 Emulator PCSX4
Developed by the creators of the famous PS3 emulator (RPCS3), this is a research-focused Linux project. Summary of Safety Tips The "PCSX4" project is a long-standing hoax
A compatibility-layer-based emulator that can run many 2D and "smaller" indie titles. Developed by the creators of the famous PS3
The search for a "PS4 Emulator" called leads to a well-known scam. There is currently no functional, high-performance PlayStation 4 emulator named PCSX4 , and any website claiming to offer a download for it is likely distributing malware or attempting to collect personal data through surveys. Why You Should Avoid PCSX4
Currently the most promising project, having recently made headlines for being able to boot and run parts of Bloodborne .
For news on emulation, rely on community-trusted sites like RPCS3.net or Emulation General Wiki .