Not sure which card they were using, but I was having some trouble with "a" watershader at school (my engineering class has nicer computers). The water appeared.... wrong, lol. I wasn't getting a flat-white surface, it was just very pixelated, as if the normalmap for the water surface was scaled VERY SMALL. Pixels of random blue & white. It supports at least PS2.0 though, because my NM shader worked fine...