Comparison of ZOTAC GeForce GTX 1080 AMP Extreme video card vs Gainward GeForce RTX 2080 Phoenix video card by specifications and benchmarks. ZOTAC GeForce GTX 1080 AMP Extreme runs at 1.771 GHz+ 10 % base clock speed and has 8 GB of GDDR5X memory, while video card Gainward GeForce RTX 2080 Phoenix runs at 1.515 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 270 W+ 50 %, and the second is 215 W. Compare the table of benchmark results to find out which graphic card is better.