Comparison of ZOTAC GAMING GeForce RTX 2070 OC MINI video card vs Gainward GeForce RTX 3090 Phantom video card by specifications and benchmarks. ZOTAC GAMING GeForce RTX 2070 OC MINI runs at 1.410 GHz base clock speed and has 8 GB of GDDR6 memory, while video card Gainward GeForce RTX 3090 Phantom runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 175 W, and the second is 370 W+ 6 %. Compare the table of benchmark results to find out which graphic card is better.