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Older cards do not have the hardware/feature set required by the OpenCL spec and thus are not supported. We have listed all cards that are supported as it requires features found in the 7XX series chips and later, which correspond to most of the HD4XXX series and later cards.
I think this review of the HD 4870 can explain why the HD2 and HD3 series aren't supported:
(explains what has been changed from previous generations regarding Stream computing)