Comparison of GIGABYTE Radeon RX 5500 XT OC 4G video card vs XFX Speedster MERC 319 Radeon RX 6800 XT Core Gaming 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 XFX Speedster MERC 319 Radeon RX 6800 XT Core Gaming runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 130 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.