Comparison of XFX Radeon RX 5700 XT Thicc II Ultra video card vs GIGABYTE Radeon RX 6800 video card by specifications and benchmarks. XFX Radeon RX 5700 XT Thicc II Ultra runs at 1.730 GHz+ 8 % base clock speed and has 8 GB of GDDR6 memory, while video card GIGABYTE 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 225 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.