Comparison of AMD Radeon HD 7640G video card vs AMD Radeon R4 (Beema) video card by specs and benchmarks. AMD Radeon HD 7640G runs at 0.500 GHz base clock speed and has 2 GB of memory, while video card AMD Radeon R4 (Beema) runs at 0.500 GHz base clock speed and has 2 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.