Comparison of AMD Radeon HD 6620G video card vs AMD Radeon R5 - 256 (Merlin Falcon) video card by specifications and benchmarks. AMD Radeon HD 6620G runs at 0.440 GHz base clock speed and has 1 GB of memory, while video card AMD Radeon R5 - 256 (Merlin Falcon) runs at 0.800 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.