AMD Radeon RX 6400 test, performance lost more than 14% on average under PCIe 3.0

IT House May 8 news, AMD launched a new Radeon RX 6400 independent graphics for the retail market last month. Although the performance is not very strong, it is still a protocol based on PCIe 4.0 channels, and there will be performance losses on some old PCIe 3.0 platforms.

TechPowerUp tested the performance of the AMD Radeon RX 6400 GPU on a PCIe 3.0 interface to calculate the performance gap with PCIe 4.0 and found that the graphics card experienced an average performance drop of over 14% depending on the resolution.

The AMD Radeon RX 6400 features AMD’s entry-level Navi 24 GPU. This product was originally used in the notebook platform, and like its big brother Radeon RX 6500 XT, in order to reduce costs, this GPU is only configured with PCIe 4.0 × 4 lanes.

IT House learned that the AMD Radeon RX 6400 uses a 6nm process technology, RDNA2 architecture, and is equipped with 768 stream processors, but still maintains 4GB 64bit GDDR6 video memory, 16 MB AMD Infinity Cache, and a base frequency of 2039 MHz. Boost frequency 2321 MHz.

Compared to the Radeon RX 6500 XT, the RX 6400 has roughly 13% fewer cores and memory bandwidth. However, since GDDR6 speeds are reduced to 16gbps, it only has 128gbps of memory bandwidth.

In general, the main advantages of Radeon RX 6400 are power saving and low price, so it can be made into a half-height knife card, which is more suitable for ITX and black apple users. After all, it only consumes 53W (half of Radeon RX 6500 XT) , which eliminates the need for an external power supply for this GPU.

Therefore, this card is a good choice for the current graphics card market and the general situation of half-height knife cards, but the domestic price is generally high compared to the overseas price of 51~160 US dollars.

Across the 24 games used in the TechPowerUp test, the performance of the Radeon RX 6400 running on PCIe 3.0 at 1080P and 1440P dropped an average of 14% over PCIe 4.0, while the 4K result dropped 23%. However, the Radeon RX 6400 isn’t meant to be a 4K gaming product, so this doesn’t make much sense.

The worst games were F1 2021 and Doom, with 79% and 43% difference in FPS respectively at 1080P, but fortunately almost every other game tested was 14% or lower Inside, it appears that these two game engines require higher PCIe bandwidth.

TechPowerUp’s test of the Radeon RX 6500 XT showed nearly identical results, showing what looks like a roughly 13 percent performance difference between PCIe 3.0 and PCIe 4.0.

Also, the Radeon RX 6400 is nearly 20% weaker at PCIe 3.0 than the GTX 1650, which runs on a PCIe 3.0×16 configuration after all. However, the Radeon RX 6400 performed as well or even better than the GeForce GTX 1650 when it was installed on a PCIe 4.0 interface.