Comparison of AMD Radeon R7 - 512 (Merlin Falcon) video card vs AMD Radeon HD 6520G video card by specs and benchmarks. AMD Radeon R7 - 512 (Merlin Falcon) runs at 0.800 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon HD 6520G runs at 0.800 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.