Comparison of PowerColor Radeon RX 6700 XT video card vs Gainward GeForce RTX 3090 Phantom GS video card by specifications and benchmarks. PowerColor Radeon RX 6700 XT runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card Gainward GeForce RTX 3090 Phantom GS runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 230 W, and the second is 420 W+ 20 %. Compare the table of benchmark results to find out which graphic card is better.