Comparison of XFX Speedster MERC 319 Radeon RX 6800 Black Gaming video card vs GIGABYTE Radeon RX Vega 64 8G video card by specifications and benchmarks. XFX Speedster MERC 319 Radeon RX 6800 Black Gaming runs at 1.850 GHz+ 9 % base clock speed and has 16 GB of GDDR6 memory, while video card GIGABYTE Radeon RX Vega 64 8G runs at 1.247 GHz base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 250 W, and the second is 295 W. Compare the table of benchmark results to find out which graphic card is better.