Comparison of ZOTAC GeForce GTX 1080 AMP Extreme video card vs AMD Radeon RX 6400 - Reference Data video card by specifications and benchmarks. ZOTAC GeForce GTX 1080 AMP Extreme runs at 1.771 GHz+ 10 % base clock speed and has 8 GB of GDDR5X memory, while video card AMD Radeon RX 6400 - Reference Data runs at base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 270 W+ 50 %, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.