The AMD RX 6800 is the objective winner of this comparison, securing more total spec victories across the evaluated fields. Its most significant advantage is a 400% increase in shader units compared to the alternative. While the AMD RX 6400 is less powerful in terms of raw processing hardware, it maintains a distinct edge in efficiency, boasting a TDP that is 79% better than the higher-tier model.

Users prioritizing raw graphical processing power should choose the AMD RX 6800 to leverage its superior shader count. Conversely, the AMD RX 6400 is the better option for builds where power consumption is the primary concern. By selecting the latter, users benefit from a significantly lower TDP, making it the appropriate choice for systems where energy efficiency is prioritized over the high-performance hardware found in the former.