I had a 9800 SE once and bought a fan (looks extremely similar and may even be the same one). It's to do with the way the memory chips are shaped IIRC (L shaped or something else). Anyways all you need to do is file down a little area on the new fan heatsink (but not on the actual area that's in contact with the GPU). It's nothing too major and shouldn't take more than 5 minutes to sort out.
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