Comparison of XFX Radeon RX 6900 XT video card vs XFX Radeon VII video card by specs and benchmarks. XFX Radeon RX 6900 XT runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 memory, while video card XFX Radeon VII runs at 1.825 GHz base clock speed and has 16 GB of HBM2 memory. The weight is different, -- vs --. The TDP of the first video card is 300 W, and the second is 300 W . Compare the benchmark results to find out which video card is better.