Comparison of Sapphire Radeon RX Vega 56 video card vs ASRock Radeon RX 6500 XT Phantom Gaming D 4GB OC video card by specifications and benchmarks. Sapphire Radeon RX Vega 56 runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card ASRock Radeon RX 6500 XT Phantom Gaming D 4GB OC runs at 2.200 GHz base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 210 W, and the second is 107 W. Compare the table of benchmark results to find out which graphic card is better.