That's why the latest AMD Ryzen 4000 processors do not support PCIe 4.0.

He is not needed in this segment.

A week ago, AMD introduced the new Ryzen 4000 mobile APUs. They should appear on laptops next month, but leaks already indicate impressive performance gains.
That's why the latest AMD Ryzen 4000 processors do not support PCIe 4.0.

Moreover, both the CPU and the GPU, despite the fact that the latter, firstly, still belong to the Vega generation, and secondly, have fewer stream processors compared to the previous generation.
That's why the latest AMD Ryzen 4000 processors do not support PCIe 4.0.

But there is another interesting feature of the new APUs, which was missed by the majority on the announcement day. The fact is that the new hybrid processors do not support PCIe 4.0. These are AMD's first consumer seven-meter solutions without support for this interface.

Our Japanese colleagues talked to an AMD representative and asked him, among other things, about this feature of the new processors. 

As it turned out, AMD decided not to implement PCIe 4.0 support in Ryzen 4000, as there are not many scenarios in the mobile PC segment where you can fully use the capabilities of the new interface.

In addition, many missed the moment that the latest hybrid Athlon Gold 3150U and Athlon Silver 3050U processors are manufactured using 14-nanometer technology, that is, they are carriers of the very first version of the Zen architect

Why is Ryzen 4000 a single die design?

"For AMD, which had not been able to launch attractive CPU products for notebook PCs for a while, I am happy to have completed a product that can be provided with confidence for a long time." Scott Stankard. He asked why the Ryzen 4000 series did not use a "chipset architecture".

The chipset architecture is a mechanism that combines multiple silicon dies, which AMD calls chipsets, to form a processor package. 

AMD has adopted this in its Zen2 generation CPU products such as the " Ryzen Desktop 3000 " series (hereinafter Ryzen 3000). It uses a CPU chipset manufactured using the most advanced 7nm process and a mature 14nm process. The CPU package was composed of I / O chipsets to be manufacture

That's why the latest AMD Ryzen 4000 processors do not support PCIe 4.0.

One of the advantages of the chipset architecture is that it can build a CPU lineup with various numbers of cores/threads. Of the Ryzen 3000, Ryzen 7/5/3 combines one CPU chipset and one dedicated I / O chipset, and Ryzen 9 combines two CPU chipsets and one dedicated I / O chipset. 

The third-generation Ryzen Threadripper for the HEDT (High-End Desktop) market has a maximum of eight CPU chiplets and one dedicated I / O chipset. The short term release of a diverse product lineup from 4 cores 4 threads to 64 cores 128 threads was due to the benefits of the chipset architecture.

However, the Ryzen 4000 series CPU package released by AMD at the CES 2020 press conference had a single-die configuration.
Source = 4Gammer

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