Gaming performance of Radeon RX 6400 in PCIe 30 mode

Gaming performance of Radeon RX 6400 in PCIe 3.0 mode drops by an average of 14% compared to PCIe 4.0

TechPowerUp recently tested the entry-level Radeon RX 6400 graphics accelerator and found that a graphics card’s gaming performance is significantly reduced when connected to a PCIe 3.0 interface. The graphics card itself is equipped with a PCIe 4.0 interface, but only supports four lanes of this bus. On average, the Radeon RX 6400 performance drops by 14% when using PCIe 3.0.

    Image source: TechPowerUp

Image source: TechPowerUp

The Radeon RX 6400 model, like the Radeon RX 6500 XT model, is based on a compact Navi 24 graphics chip. Only the younger version has 13% fewer processing units, and the graphics card memory has the same 13% less bandwidth. The chip contains only 768 stream processors and the bandwidth of 4 GB GDDR6 at 16 Gb/s is 128 GB/s. The power consumption of the accelerator is only 53 watts.

After testing the Radeon RX 6400 in 24 games, TechPowerUp came to the conclusion that when the graphics card is connected to the PCIe 3.0 interface or the corresponding settings in the BIOS, the accelerator performance is reduced by an average of 14% in games with 1080p and 1080p 1440p- Resolutions compared to PCIe 4.0. When it comes to 4K resolution games, the picture is even sadder – a drop of 23% on average. However, this hardly matters, since the Radeon RX 6400 shows unsatisfactory performance even when using the PCIe interface of any standard.

The strongest performance drops during the tests were observed in the games F1 2021 and Doom Eternal, writes TechPowerUp. There, the drop in performance when going from PCIe 4.0 to PCIe 3.0 at 1080p was 79% and 43%, respectively.

Tests of the Radeon RX 6500 XT graphics card from the same source showed similar results – the performance difference between PCIe 3.0 and PCIe 4.0 was about 13%. In PCIe 3.0 mode, the Radeon RX 6400 was almost 20% slower than the GeForce GTX 1650, which also runs in PCIe 3.0 mode but supports all 16 graphics lines of the interface. When using PCIe 4.0, the Radeon graphics card shows a similar level of performance as the GeForce GTX 1650.

If you have the Radeon RX 6400 in mind, we recommend a motherboard that has a PCIe 4.0 connector. Otherwise, an unpleasant surprise awaits them. The problem is that most home computers in use today only support PCIe 3.0. At the same time, it is very likely that the potential Radeon RX 6400 owners are the ones who are thinking about upgrading their old system.

If the computer’s motherboard doesn’t have access to a PCIe 4.0 x16 slot, the preferred choice over the Radeon RX 6400 is the GeForce GTX 1650 or even the Radeon RX 570, which by the way is faster than the Radeon RX 6400 and doesn’t require PCIe 4.0 Interface.

About the author

Dylan Harris

Dylan Harris is fascinated by tests and reviews of computer hardware.

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