Comparison of XFX Radeon RX 5600 XT Thicc III Ultra video card vs MSI Radeon RX 580 Mech 2 8G OC video card by specifications and benchmarks. XFX Radeon RX 5600 XT Thicc III Ultra runs at 1.130 GHz base clock speed and has 6 GB of GDDR6 memory, while video card MSI Radeon RX 580 Mech 2 8G OC runs at 1.257 GHz base clock speed and has 8 GB of GDDR5 memory. The TDP of the first video card is 160 W, and the second is 185 W. Compare the table of benchmark results to find out which graphic card is better.