Comparison of Gainward GeForce RTX 2080 SUPER Phoenix video card vs XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming video card by specs and benchmarks. Gainward GeForce RTX 2080 SUPER Phoenix runs at 1.650 GHz base clock speed and has 8 GB of GDDR6 memory, while video card XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming runs at 1.650 GHz base clock speed and has 12 GB of GDDR6 memory. The weight is different, -- vs --. The TDP of the first video card is 250 W, and the second is 250 W . Compare the benchmark results to find out which video card is better.