RegHardware: Group Test: AMD Radeon HD 4000 series

RegHardware: "When AMD updated the RV670 chip used in the ATI Radeon HD 3000 series to the RV770 in the HD 4000 line, it went ballistic and increased the number of unified shaders from 320 to 800.

This change increased performance by a healthy amount and made the HD 4850 the apple of Register Hardware's eye. But that was only the start of the story."

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