Comparison of XFX Radeon RX 5700 XT Thicc III video card vs Gainward GeForce RTX 3080 12GB Phantom GS video card by specifications and benchmarks. XFX Radeon RX 5700 XT Thicc III runs at 1.670 GHz+ 4 % base clock speed and has 8 GB of GDDR6 memory, while video card Gainward GeForce RTX 3080 12GB Phantom GS runs at 1.260 GHz base clock speed and has 12 GB of GDDR6X memory. The TDP of the first video card is 225 W, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.