There are more than 4 versions availible.
R9800TX (Dell name)
R9800SE 256bit memory
R9800SE 128bit memory
And those are just the majory ones.
But by the same token there are many versions of the FX5900. Gainward makes one slightly overclocked (Golden Sample), and MSI makes one slightly underclocked (VTD), and they have their own names.
And I'd say get one of the the Radeons ABOVE the R9800TX if you want to play DX9 titles, and whichever is cheaper if your focus is on older or DX7/8 titles.
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