Comparison of ASRock Phantom Gaming X Radeon RX Vega 56 video card vs ZOTAC GeForce GTX 1080 AMP Extreme video card by specifications and benchmarks. ASRock Phantom Gaming X Radeon RX Vega 56 runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card ZOTAC GeForce GTX 1080 AMP Extreme runs at 1.771 GHz+ 10 % base clock speed and has 8 GB of GDDR5X memory. The TDP of the first video card is 210 W, and the second is 270 W+ 50 %. Compare the table of benchmark results to find out which graphic card is better.