Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0 - WritenAreGiven

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Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0

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The performance gain is very large

AMD Ryzen 3000 processors are the first to receive PCIe 4.0 support. The same interface is also supported by the Radeon RX 5700 and RX 5500 line of graphics cards.


Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0

In the summer, we were convinced that this interface expectedly does not give any advantage to the Radeon RX 5700. However, recent tests show that the Radeon RX 5500 XT for some reason receives such an advantage.


Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0
Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0

As you can see, the results are often really far from the 2% that we saw with the Radeon RX 5700 tests. The increase can be 20-30% or even 70%. The biggest advantage is the low-end card with 4 GB of memory.

Radeon RX 5500 XT - the first graphics card that really needs PCIe 4.0

The most impressive results were in Wolfenstein: Youngblood. Firstly, the increase in the younger card is almost twofold, and secondly, the difference between the versions with 4 and 8 GB is more than three times, which is explained by the id Tech 6 engine, on which the game is based.

So what is the reason for the impact of PCIe 4.0 on the performance of the Radeon RX 5500 XT? The thing is that this adapter has only eight PCIe lanes instead of the full 16. 

And this means that when connected via PCIe 3.0, the adapter works in PCIe 3.0 x8 mode, and this is clearly not enough. In the case of the RX 5700, we are talking about all 16 lines of PCIe, which is enough even in the case of PCIe 3.0.

Thus, all the early tests of the Radeon RX 5500 XT, which are on the Web, need to be reviewed, evaluating, including from the point of view of the platform. Because in the case of using PCIe 4.0, the smaller version with 4 GB will obviously often be significantly faster than the GeForce GTX 1650 Super.

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