Comparison of ASRock Radeon RX 7900 XTX Phantom Gaming 24GB OC video card vs XFX Speedster MERC 310 Radeon RX 7900 XTX Black Edition video card by specifications and benchmarks. ASRock Radeon RX 7900 XTX Phantom Gaming 24GB OC runs at 1.900 GHz base clock speed and has 24 GB of GDDR6 memory, while video card XFX Speedster MERC 310 Radeon RX 7900 XTX Black Edition runs at 1.900 GHz base clock speed and has 24 GB of GDDR6 memory. The TDP of the first video card is 355 W, and the second is 355 W. Compare the table of benchmark results to find out which graphic card is better.