Comparison of ASRock Radeon RX 6700 XT 12GB video card vs XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming video card by specifications and benchmarks. ASRock Radeon RX 6700 XT 12GB runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card XFX Speedster MERC 319 Radeon RX 6900 XT Ultra Gaming runs at 1.925 GHz+ 5 % base clock speed and has 16 GB of GDDR6 memory. The TDP of the first video card is 230 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.