Comparison of ASRock Radeon RX 6750 XT Phantom Gaming D 12GB OC video card vs XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming video card by specifications and benchmarks. ASRock Radeon RX 6750 XT Phantom Gaming D 12GB OC runs at 2.235 GHz+ 2 % base clock speed and has 12 GB of GDDR6 memory, while video card XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming runs at 2.324 GHz+ 6 % base clock speed and has 12 GB of GDDR6 memory. The TDP of the first video card is 250 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.