if it only supports a 4x, there is very little chance of running an 8x agp on it. however if you do wish to go ahead and try, and it does work, it will most likely be just as bad as what you are doing now, in other words lagging, and sticking on the system. can you find a new motherboard? I am not sure how much they run, but if you still wish to buy that, then at least upgrade the motherboard too
