There are only official system requirements on the site which are released by developers or an official publisher.
3GHz P4 or Intel Core 2 Duo 2GHz or equivalent
DirectX 9c, 10 or 11 compatible card with PS3.0 128MB GDDR3 or better RAM and Nvidia 6800 or ATI x 1600 or better performance
Windows XP SP3/Vista SP2/Windows 7
4 GB free space
1024x768 resolution @ 20FPS
The game's system requirements are extremely low that's why making a comparison is not feasible.
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