Comparison of ASRock Radeon RX 6600 Challenger D video card vs GIGABYTE Radeon RX Vega 56 Gaming OC 8G video card by specifications and benchmarks. ASRock Radeon RX 6600 Challenger D runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card GIGABYTE Radeon RX Vega 56 Gaming OC 8G runs at 1.170 GHz+ 1 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 132 W, and the second is 250 W+ 19 %. Compare the table of benchmark results to find out which graphic card is better.