Radeon RX 480 vs Radeon RX 6400

Speed and memory

In our performance index the Radeon RX 480 scores 8.5 and the Radeon RX 6400 scores 8, which makes the Radeon RX 480 about 6% faster. That is a small gap, below what most people notice without a frame counter.

The Radeon RX 480 has 8 GB of video memory and the Radeon RX 6400 has 4 GB. That difference matters at 1440p and in new games at High textures, and it can outweigh a small speed advantage as the card ages.

In our estimates for popular games at 1080p on High, the biggest gap is in Call of Duty (24 against 16 fps), and the smallest is in Fortnite (97 against 92 fps). Games that are light enough to run above 200 fps on both cards show little difference at all.

Power and value

The Radeon RX 480 is rated at 150 W and the Radeon RX 6400 at 53 W. With a mid-range processor that means a power supply of about 550 W for the first and 450 W for the second. A gap of 97 W shows up in heat and fan noise, and in your electricity use over a few years.

At launch the Radeon RX 480 cost $239 and the Radeon RX 6400 $159. Per dollar, the Radeon RX 6400 gave more performance (5.0 points per $100 against 3.6). Current prices differ, so run the same sum on what you can actually buy today.

Which one to buy

Choose the Radeon RX 480 if you want the faster card, and it also has at least as much memory. It makes the most sense at 1440p and above, or on a monitor with a high refresh rate.

Choose the Radeon RX 6400 if the price gap matters more than the 6% speed difference, or if you want lower power draw and a quieter PC. Whichever you pick, check reviews for the games you play, because two cards with similar scores can differ in individual titles.