Comparison of AMD Radeon R4 (Stoney Ridge) video card vs AMD Radeon HD 6550D video card by specs 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 HD 6550D runs at 0.660 GHz base clock speed and has 1 GB of memory. The weight is different, -- vs --. The TDP of the first video card is --, and the second is -- . Compare the benchmark results to find out which video card is better.