Comparison of AMD Radeon R3 (Stoney Ridge) video card vs AMD Radeon HD 7420G video card by specifications and benchmarks. AMD Radeon R3 (Stoney Ridge) runs at 0.660 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.