Comparison of GALAX GeForce GTX 1080 Ti EX OC video card vs ZOTAC GeForce GTX 980 Ti AMP! Extreme video card by specifications and benchmarks. GALAX GeForce GTX 1080 Ti EX OC runs at 1.531 GHz+ 3 % base clock speed and has 11 GB of GDDR5X memory, while video card ZOTAC GeForce GTX 980 Ti AMP! Extreme runs at 1.253 GHz+ 25 % base clock speed and has 6 GB of GDDR5 memory. The TDP of the first video card is 250 W, and the second is 250 W. Compare the table of benchmark results to find out which graphic card is better.