Comparison of PowerColor Radeon RX Vega 56 Nano Edition video card vs ZOTAC GeForce GTX 1080 IceStorm 2X video card by specifications and benchmarks. PowerColor Radeon RX Vega 56 Nano Edition runs at 1.156 GHz base clock speed and has 8 GB of HBM2 memory, while video card ZOTAC GeForce GTX 1080 IceStorm 2X runs at 1.607 GHz 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.