Comparison of PowerColor Radeon VII video card vs XFX Speedster MERC 310 Radeon RX 7900 XT Black Edition video card by specifications and benchmarks. PowerColor Radeon VII runs at 1.400 GHz base clock speed and has 16 GB of HBM2 memory, while video card XFX Speedster MERC 310 Radeon RX 7900 XT Black Edition runs at 1.500 GHz base clock speed and has 20 GB of GDDR6 memory. The TDP of the first video card is 300 W, and the second is 300 W. Compare the table of benchmark results to find out which graphic card is better.