Comparison of PowerColor Radeon RX 6800 video card vs Biostar Radeon RX Vega 56 8G video card by specifications and benchmarks. PowerColor Radeon RX 6800 runs at 1.700 GHz base clock speed and has 16 GB of GDDR6 memory, while video card Biostar Radeon RX Vega 56 8G runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 250 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.