Comparison of AMD Radeon RX 6400 - Reference Data video card vs PowerColor Radeon RX 6400 ITX 4GB video card by specifications and benchmarks. AMD Radeon RX 6400 - Reference Data runs at base clock speed and has 4 GB of GDDR6 memory, while video card PowerColor Radeon RX 6400 ITX 4GB runs at 1.923 GHz base clock speed and has 4 GB of GDDR6 memory. The TDP of the first video card is 53 W, and the second is 53 W. Compare the table of benchmark results to find out which graphic card is better.