Comparison of ASRock Radeon RX 6700 XT Challenger D 12GB OC video card vs GIGABYTE Radeon RX Vega 56 8G video card by specifications and benchmarks. ASRock Radeon RX 6700 XT Challenger D 12GB OC runs at 2.330 GHz base clock speed and has 12 GB of GDDR6 memory, while video card GIGABYTE 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 230 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.