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Sounds like you're getting the software renderer for some reason (instead of an OpenGL hardware-accelerated renderer). First, try running the Aquarium application (instead of the screen saver) in a window and try it on either monitor (I'm assuming a multi-monitor set-up based on your comparison of two video cards) to see if the problem occurs on both monitors or only one. If the problem occurs on only one card, then I'd suspect a driver problem. You might check the ATI site for any driver updates for your system.
Also, what size monitor(s) do you use? At what resolution? How many colors? To eliminate the possibility of lack of VRAM causing the problem, try using thousands of colors at a resolution of 1024x768 or less. If the Radeon 7000 has 16MB or more of VRAM, it shouldn't be a problem.
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