Comparison of MSI Radeon RX 5700 XT Evoke OC video card vs XFX Speedster MERC 319 Radeon RX 6800 Black Gaming video card by specifications and benchmarks. MSI Radeon RX 5700 XT Evoke OC runs at 1.690 GHz+ 5 % base clock speed and has 8 GB of GDDR6 memory, while video card 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. The TDP of the first video card is 225 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.