Comparison of Gainward GeForce GTX 1080 Phoenix GS video card vs AMD Radeon RX 6400 - Reference Data video card by specifications and benchmarks. Gainward GeForce GTX 1080 Phoenix GS runs at 1.708 GHz+ 6 % 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 180 W, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.