Comparison of Sapphire Nitro+ Radeon RX Vega 56 video card vs Gainward GeForce RTX 3080 Phantom GS video card by specifications and benchmarks. Sapphire Nitro+ Radeon RX Vega 56 runs at 1.266 GHz+ 10 % base clock speed and has 8 GB of HBM2 memory, while video card Gainward GeForce RTX 3080 Phantom GS runs at 1.440 GHz base clock speed and has 10 GB of GDDR6X memory. The TDP of the first video card is 325 W+ 55 %, and the second is 370 W+ 16 %. Compare the table of benchmark results to find out which graphic card is better.