Comparison of ZOTAC GeForce GTX 1080 AMP Extreme video card vs Gainward GeForce RTX 3090 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 3090 Phoenix runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 270 W+ 50 %, and the second is 350 W. Compare the table of benchmark results to find out which graphic card is better.