Comparison of XFX Radeon RX 5600 XT Thicc III Ultra video card vs MSI Radeon RX 6600 XT MECH 2X 8G OC video card by specs 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 6600 XT MECH 2X 8G OC runs at 1.130 GHz base clock speed and has 8 GB of GDDR6 memory. The weight is different, -- vs 721 g. The TDP of the first video card is 160 W, and the second is 160 W . Compare the benchmark results to find out which video card is better.