Comparison of ZOTAC GeForce GTX 1080 Ti AMP Extreme video card vs GALAX GeForce GTX 1660 Prodigy video card by specifications and benchmarks. ZOTAC GeForce GTX 1080 Ti AMP Extreme runs at 1.645 GHz+ 11 % base clock speed and has 11 GB of GDDR5X memory, while video card GALAX GeForce GTX 1660 Prodigy runs at 1.530 GHz base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 320 W+ 28 %, and the second is 120 W. Compare the table of benchmark results to find out which graphic card is better.