Comparison of GIGABYTE GeForce GTX 1660 TI OC 6G video card vs Gainward GeForce RTX 3090 Phantom GS video card by specifications and benchmarks. GIGABYTE GeForce GTX 1660 TI OC 6G runs at 1.500 GHz base clock speed and has 6 GB of GDDR6 memory, while video card Gainward GeForce RTX 3090 Phantom GS runs at 1.395 GHz base clock speed and has 24 GB of GDDR6X memory. The TDP of the first video card is 120 W, and the second is 420 W+ 20 %. Compare the table of benchmark results to find out which graphic card is better.