Comparison of PowerColor Liquid Devil Radeon RX 6900 XT Ultimate video card vs Sapphire Nitro+ Radeon RX Vega 56 video card by specifications and benchmarks. PowerColor Liquid Devil Radeon RX 6900 XT Ultimate runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card Sapphire Nitro+ Radeon RX Vega 56 runs at 1.266 GHz+ 10 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 325 W+ 55 %. Compare the table of benchmark results to find out which graphic card is better.