Comparison of AMD Radeon HD 8550G video card vs AMD Radeon HD 7420G video card by specifications and benchmarks. AMD Radeon HD 8550G runs at 0.520 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon HD 7420G runs at 0.480 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.