Comparison of AMD Radeon HD 7420G video card vs AMD Radeon R7 - 512 (Toronto) video card by specifications and benchmarks. AMD Radeon HD 7420G runs at 0.480 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon R7 - 512 (Toronto) 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.