Comparison of ASRock Radeon RX 6600 XT Challenger ITX 8GB video card vs MSI Radeon RX 6800 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 MSI Radeon RX 6800 runs at 1.700 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 160 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.