The difference in performance is next to non-existant,just get the GDDR3 version,much better price,performance than the GDDR4 could ever hope to acheive.
The GDDR4 version does do a bit better overall, I'd get it if it was maybe $10 more than the GDDR3 version.
Oh, and note that many of the HD2600XT GDDR3 cards out there are underclocked a bit.. they usually have the core clocked at like 700/750MHz IIRC, stock clock is supposed to be 800MHz for the core.
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