PlayStation 1 emulator System requirements
It's hard to say the exact system requirements, it heavily depends on which game you're playing.
If you experience too much lag, then changing to a lower resolution may drastically improve your fps.
These are the rough estimate system requirements for an PlayStation 4 game:
System requirements
Right now the emulator works on Windows, Linux, Mac & Android.
Minimum:
OS: Windows XP or later (both 32/64bit versions)
Processor: Intel Pentium IV @ 3.0 GHz / AMD Athlon64 3000 + @ 1.8 GHz or higher
RAM: 2GB
Graphic card: nVidia GeForce 6800GT / AMD Radeon X1950 Pro (256MB VRAM with Shader Model 3.0) or higher
Graphics card memory: 2 GB
Recommended:
OS: Windows XP or later (both 32/64bit versions)
Processor: Intel Core 2 Duo E4400 @ 2.0 GHz / AMD Athlon64 X2
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RAM: 4GB
Graphic card: nVidia GeForce 9600GT or higher, AMD Radeon HD3850 (512MB VRAM with Shader Model 4.0)
Graphics card memory: 4 GB