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gt and xt class and any other letters after the number refer to the the class thier in. core/mem speed are different in each card. like the ati radeon x850pro is clock at 500/500. the xt is however clock at 520/540 i think and also has 4 extra more pipelines. the 6800 gt i think is superior in core/mem speed than the xt and the 6600. i think companys like bfg and evga clocked thier cards at different speeds. those brands are overclock cards. there are others of course.
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