Radeon RX 6400 Suffers 14% Performance Loss Over PCIe 3.0

Radeon RX 6400 Suffers 14% Performance Loss Over PCIe 3.0

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TechPowerUp recently tested AMD’s new Radeon RX 6400 GPU on the slower PCIe 3.0 interface to measure any substantial drops in performance compared to PCIe 4.0 and found that to be the case thanks to the GPU’s unorthodox configuration of just four PCIe lanes. On average, performance drop-offs were upwards of 14%, depending on the resolution.

AMD’s Radeon RX 6400 is the company’s newest entry-level GPU for the desktop market featuring AMD’s super tiny Navi 24 die, initially for laptops. Like its bigger brother, the Radeon RX 6500 XT, this GPU only packs four PCIe 4.0 lanes as a measure to cut down costs. The Radeon RX 6400 features a rough 13% reduction in core count and memory bandwidth compared to the Radeon RX 6500 XT. The graphics card has just 768 cores and 128 GBps of memory bandwidth, thanks to a reduction in GDDR6 speeds to 16 Gbps. However, memory capacity stays the same at 4GB. But the Radeon RX 6400’s main strength is its power consumption. It has half the Radeon RX 6500 XT power draw for 53W, making this GPU very useful in small systems budget systems that cannot power higher-end GPUs with auxiliary power. 

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