Comparison of XFX Radeon RX 5700 DD Ultra video card vs Biostar Radeon RX Vega 56 8G video card by specifications and benchmarks. XFX Radeon RX 5700 DD Ultra runs at 1.565 GHz+ 7 % base clock speed and has 8 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 180 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.