|The difference between 4x & 8x may not matter in your case. |
All that means is the total amount of data that can be pushed though your bus.
If the video card is not capable of exceeding the amount of data AGP 4x can handle then it won't make a bit of difference. I suspect that is the case.
I am not a gamer but it is my understanding the Crysis is very demanding.
As I stated I am not a gamer so Maybe I am wrong about your card.