Comparison of ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC video card vs ASUS AREZ Strix Radeon RX Vega 56 OC Gaming video card by specifications and benchmarks. ASRock Radeon RX 6800 XT Phantom Gaming D 16G OC runs at 1.875 GHz+ 3 % base clock speed and has 16 GB of GDDR6 memory, while video card ASUS AREZ Strix Radeon RX Vega 56 OC Gaming runs at 1.297 GHz+ 12 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 300 W, and the second is 300 W+ 43 %. Compare the table of benchmark results to find out which graphic card is better.