Comparison of AMD Radeon HD 7640G video card vs AMD Radeon HD 6379D video card by specifications and benchmarks. AMD Radeon HD 7640G runs at 0.500 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon HD 6379D runs at 0.440 GHz base clock speed and has 1 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.