Radeon RX 6400

The Radeon RX 6400 is AMD's entry-level RDNA 2 graphics card, launched in early 2022 as an affordable option for basic discrete graphics. It is the lowest-tier card in the RX 6000 series and targets systems where a low-profile, low-power card is needed — including small form factor PCs and pre-built desktops with limited power delivery.

The RX 6400 comes with 4GB of GDDR6 memory on an unusually narrow 64-bit memory bus, which significantly constrains its memory bandwidth compared to other RDNA 2 cards with wider buses. While RDNA 2 introduced hardware ray tracing and AMD Infinity Cache across the lineup, the RX 6400's implementation of Infinity Cache is limited and does not fully offset the narrow bus. Notably, the card does not support hardware video encoding — neither AV1 nor H.264/H.265 — making it unsuitable for streaming or content creation workflows. Its TDP of approximately 53W means it draws power directly from the PCIe slot without requiring an external connector, and it launched at $159.

The RX 6400 is suited for light gaming at 1080p with medium settings in less demanding titles, and for users who need a basic discrete GPU to replace integrated graphics without modifying their system's power setup. It is not designed for high-refresh or graphically intensive gaming, and buyers with a slightly larger budget will find significantly better options elsewhere in the RX 6000 lineup.