Comparison of GIGABYTE GeForce RTX 3080 Ti Gaming OC 12G video card vs Gainward GeForce RTX 3090 Phoenix GS video card by specs and benchmarks. GIGABYTE GeForce RTX 3080 Ti Gaming OC 12G runs at 1.365 GHz base clock speed and has 12 GB of GDDR6X memory, while video card Gainward GeForce RTX 3090 Phoenix GS runs at 1.365 GHz base clock speed and has 24 GB of GDDR6X memory. The weight is different, -- vs --. The TDP of the first video card is 350 W, and the second is 350 W . Compare the benchmark results to find out which video card is better.