The speculation about the clock speeds of ATIs flagship X800XT Platinum edition has come to an end as the company has confirmed that the boards will carry an official 520/560 MHz rating. This statement had to be produced by the Canadian graphics firm since the latest rumours suggested an inconsistency on the versions of the boards sent to review sites. Most of the boards tested, did feature the same clock speeds as the ones announced but there were, also, some exceptions with some review cores …