Comparison of SAPPHIRE Radeon RX 6700 XT video card vs PowerColor Radeon RX Vega 56 Red Devil video card by specifications and benchmarks. SAPPHIRE Radeon RX 6700 XT runs at 2.321 GHz base clock speed and has 12 GB of GDDR6 memory, while video card PowerColor Radeon RX Vega 56 Red Devil runs at 1.308 GHz+ 13 % base clock speed and has 8 GB of HBM2 memory. The TDP of the first video card is 230 W, and the second is 210 W. Compare the table of benchmark results to find out which graphic card is better.