Comparison of GIGABYTE GeForce GTX 1660 OC 6G video card vs ZOTAC GAMING GeForce RTX 2080 Blower video card by specifications and benchmarks. GIGABYTE GeForce GTX 1660 OC 6G runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory, while video card ZOTAC GAMING GeForce RTX 2080 Blower runs at 1.515 GHz base clock speed and has 8 GB of GDDR6 memory. The TDP of the first video card is 120 W, and the second is 215 W. Compare the table of benchmark results to find out which graphic card is better.