What water-setting do you have and what other settings in the ini-files? Are you sure you run the game with 32 bit color-depth? It would help us to determine what the problem is, if you post your settings listed under "[Render_OpenGL]" from your conf.ini-file.
If somebody has the same card you have, but no such problems, it's likely your settings rather than the drivers.
Besides that: Did you deinstall and reinstall drivers after switching your cards?
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