Comparison of Sapphire Nitro+ Radeon RX Vega 56 video card vs GIGABYTE Radeon RX Vega 64 8G video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX Vega 56 runs at 1.266 GHz+ 10 % base clock speed and has 8 GB of HBM2 memory, while video card GIGABYTE Radeon RX Vega 64 8G runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 325 W+ 55 %, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.