Comparison of XFX Speedster MERC 319 Radeon RX 6800 XT Black Gaming video card vs Sapphire Radeon RX 6800 XT video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6800 XT Black Gaming runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory, while video card Sapphire Radeon RX 6800 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.