Comparison of GIGABYTE Radeon RX Vega 56 8G video card vs ZOTAC GeForce GTX 1080 AMP Edition video card by specifications and benchmarks. GIGABYTE Radeon RX Vega 56 8G runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card ZOTAC GeForce GTX 1080 AMP Edition runs at 1.683 GHz+ 5 % base clock speed and has 8 GB of GDDR5X memory. The TDP of the first video card is 210 W, and the second is 230 W+ 28 %. Compare the table of benchmark results to find out which graphic card is better.