I think there is a misunderstanding regarding water settings. Water=1 or 2 are settings optimized for the ATI card, Water=3 or 4 are settings optimized for Nvidia cards. Water=2 on a ATI card gives you the same results as Water=4 on a Nvidia card. So for your ATI card, Water=2 does give you perfect setting. Does it look different compared to an Nvidia card? If so, then it is the rendering code that instructs the card how to display the water.
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