Comparison of AMD Radeon RX 660M video card vs AMD Radeon Vega 8 Graphics video card by specs and benchmarks. AMD Radeon RX 660M runs at 1.900 GHz base clock speed and has 8 GB of memory, while video card AMD Radeon Vega 8 Graphics runs at 1.900 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.