Comparison of GIGABYTE Radeon RX 6800 XT Gaming OC 16G video card vs AMD Radeon RX 6400 - Reference Data video card by specifications and benchmarks. GIGABYTE Radeon RX 6800 XT Gaming OC 16G runs at 1.825 GHz base clock speed and has 16 GB of GDDR6 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 300 W, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.