Comparison of AMD Radeon HD 8400 video card vs AMD Radeon Vega 8 Graphics video card by specifications and benchmarks. AMD Radeon HD 8400 runs at 0.600 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon Vega 8 Graphics runs at 1.800 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.