Comparison of MSI Radeon RX 5500 XT Mech 4G video card vs PowerColor Hellhound Radeon RX 6600 XT video card by specifications and benchmarks. MSI Radeon RX 5500 XT Mech 4G runs at 1.607 GHz base clock speed and has 4 GB of GDDR6 memory, while video card PowerColor Hellhound Radeon RX 6600 XT runs at 1.968 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 130 W, and the second is 160 W. Compare the table of benchmark results to find out which graphic card is better.