Comparison of AMD Radeon R4 (Stoney Ridge) video card vs AMD Radeon R7 - 512 (Kaveri) video card by specifications and benchmarks. AMD Radeon R4 (Stoney Ridge) runs at 0.660 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon R7 - 512 (Kaveri) runs at 0.860 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.