Comparison of ASRock Radeon RX 6600 XT Challenger ITX 8GB video card vs ASUS Mining Radeon RX Vega 64 video card by specifications and benchmarks. ASRock Radeon RX 6600 XT Challenger ITX 8GB runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ASUS Mining Radeon RX Vega 64 runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 160 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.