Comparison of XFX Speedster MERC 319Radeon RX 6750 XT Black Gaming video card vs ASRock Radeon RX 6750 XT Phantom Gaming D 12GB OC video card by specs and benchmarks. 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, while video card ASRock Radeon RX 6750 XT Phantom Gaming D 12GB OC runs at 2.324 GHz+ 6 % base clock speed and has 12 GB of GDDR6 memory. The weight is different, -- vs 1187 g. 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.