Xbox 360 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 Xbox 360 game:

Minimum:

OS: Windows XP, Vista or Windows 7
Processor: Core 2 Duo 2.4 GHz or Althon X2 2.7 GHz
RAM: 2GB
Graphic card: ATI Radeon 3870 or higher, Nvidia GeForce 8800 GT or higher.
Graphics card memory: 512 MB

Recommended:

OS: Windows XP, Vista or Windows 7
Processor: Hexacore Intel or AMD CPU 3.33 gHz or higher.
RAM: 4GB
Graphic card: Nvidia GeForce GTX 560 or ATI Radeon 6950 or higher.
Graphics card memory: 1 GB

Note: These may vary greatly depending on the game you play with it.