Comparison of ASUS Phoenix Radeon RX 550 4G EVO video card vs XFX Speedster MERC 319 Radeon RX 6800 XT Core Gaming video card by specifications and benchmarks. ASUS Phoenix Radeon RX 550 4G EVO runs at 1.100 GHz base clock speed and has 4 GB of GDDR5 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 50 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.