Comparison of Gainward GeForce RTX 2080 Phantom GS video card vs ZOTAC GAMING GeForce RTX 2080 Ti AMP video card by specifications and benchmarks. Gainward GeForce RTX 2080 Phantom GS runs at 1.515 GHz base clock speed and has 8 GB of GDDR6 memory, while video card ZOTAC GAMING GeForce RTX 2080 Ti AMP runs at 1.350 GHz base clock speed and has 11 GB of GDDR6 memory. The TDP of the first video card is 215 W, and the second is 260 W+ 4 %. Compare the table of benchmark results to find out which graphic card is better.