Comparison of AMD Radeon HD 7660D video card vs AMD Radeon HD 8670D video card by specifications and benchmarks. AMD Radeon HD 7660D runs at 0.800 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon HD 8670D runs at 0.840 GHz base clock speed and has 2 GB of memory. The TDP of the first video card is --, and the second is --. Compare the table of benchmark results to find out which graphic card is better.