tomshardware has a graphics card hierarchy chart that shows thex800xl as 2 or 3 levels higher in performance (depending on if the 7300gt is ddr2 or ddr3).
Edit: I see you posted as I was writing. The same chart has the x800 gt on par with the 7300 GT GDDR2 and the 7300 GT GDDR3 one step higher. So they will be relatively comparable cards I would say.
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