Comparison of GIGABYTE Radeon RX 5500 XT OC 4G video card vs Sapphire Radeon RX 6600 video card by specifications and benchmarks. GIGABYTE Radeon RX 5500 XT OC 4G runs at 1.607 GHz base clock speed and has 4 GB of GDDR6 memory, while video card Sapphire Radeon RX 6600 runs at 1.626 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 132 W. Compare the table of benchmark results to find out which graphic card is better.