Comparison of PowerColor Hellhound Radeon RX 6600 XT video card vs AMD Radeon RX 6800 XT video card by specifications and benchmarks. PowerColor Hellhound Radeon RX 6600 XT runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory, while video card AMD Radeon RX 6800 XT runs at 1.825 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 300 W. Compare the table of benchmark results to find out which graphic card is better.