AMD is expected to launch the successor to its ATI Radeon HD 2600 in January, and now the two new parts' speed details have emerged. Graphics card maker sources cited by DigiTimes point two versions of the 'RV635' GPU one an XT model, the other a Pro. The former will be clocked at 800MHz, the latter at 600MHz. The chips support DirectX 10.1 - due to be released with Windows Vista Service Pack 1 early next year.
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