Comparison of PowerColor Hellhound Radeon RX 6600 video card vs Gainward GeForce RTX 3090 Phantom video card by specifications and benchmarks. PowerColor Hellhound Radeon RX 6600 runs at 1.626 GHz base clock speed and has 8 GB of GDDR6 memory, while video card Gainward GeForce RTX 3090 Phantom runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 132 W, and the second is 370 W+ 6 %. Compare the table of benchmark results to find out which graphic card is better.