TechPowerUp recently tested the new AMD Radeon RX 6400 GPU on the slower PCIe 3.0 interface to measure significant declines in performance compared to PCIe 4.0 and found that this is due to the unorthodox GPU configuration of only four PCIe lanes. On average, the drop in productivity was over 14%, depending on the resolution.

AMD’s Radeon RX 6400 is the company’s latest entry-level graphics processor for the desktop market, including AMD’s ultra-small Navi 24 matrix, originally for laptops. Like its older brother, the Radeon RX 6500 XT, this GPU has only four PCIe 4.0 tapes as a cost-cutting measure. The Radeon RX 6400 features a rough 13% reduction in the number of cores and memory bandwidth compared to the Radeon RX 6500 XT. The graphics card has only 768 cores and 128 GBps of memory bandwidth, thanks to the reduction of GDDR6 speeds to 16 Gbps. However, the memory capacity remains the same – 4GB. But the main strength of the Radeon RX 6400 is its power consumption. It has half the power of the Radeon RX 6500 XT for 53 W, which makes this GPU very useful in small systems with budget systems that cannot power higher-end GPUs with auxiliary power.

https://www.tomshardware.com/news/radeon-rx-6400-suffers-14-performance-loss-over-pcie-30

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