Comparison of XFX Radeon RX 5700 XT Thicc III video card vs XFX Radeon RX 580 GTS Black Edition 8GB 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 XFX Radeon RX 580 GTS Black Edition 8GB runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 225 W, and the second is 185 W. Compare the table of benchmark results to find out which graphic card is better.