How to judge whether the computer supports PCIe 4.0?

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Many smart users have already understood the concept of PCIe 4.0, but they are still a little confused about whether their computer can support PCIe 4.0. Can a solid state supporting PCIe 4.0 be able to enjoy PCIe 4.0 bandwidth? So this Speed ​​Shark class will teach you how to judge whether the computer supports PCIe 4.0.

First of all, let’s talk about PCIe 4.0 from the perspective of parameters. We all know that PCIe 4.0 is a bus protocol standard, but it is not a technical performance of a single type of hardware, but an industry standard, which is a bit similar to the 5G of mobile phones. Manufacturers will make corresponding products according to this specification, and as long as the products produced can meet the bandwidth requirements under the PCIe 4.0 specification, then it can be said that this product supports PCIe 4.0.

In a computer, PCIe channels including PCIe 4.0 are managed by the CPU. That is to say, if your computer wants to use PCIe 4.0, then the first condition to be met is that the CPU can support PCIe 4.0. If your CPU does not support PCIe 4.0, even if your solid state supports PCIe 4.0, it will not reach the rate of PCIe 4.0 in the end, and at most it will only be the rate of PCIe 3.0.

Three-generation Ryzen processor

At present, the only CPUs that support PCIe 4.0 in the desktop market are AMD’s third-generation Ryzen and the upcoming Zen3 processors . Intel does not yet have them. However, Intel expects to launch processors that support PCIe 4.0 in new products next year. So users who want to experience PCIe 4.0 now can only choose AMD’s third-generation Ryzen platform.

Of course, it is not enough to have a CPU that supports PCIe 4.0. If we want to use PCIe 4.0, we need a carrier. Of course, that carrier is the motherboard. There are two interfaces on the motherboard to output PCIe 4.0, one is the M.2 interface, and the other is the graphics card slot.

Graphics card and M.2 slot

But like CPU, not all motherboards support PCIe 4.0, but motherboards with B450, B550, X470, and X570 chipsets that echo the third-generation Ryzen can support PCIe 4.0, but note that B450 and X470 are on Chipsets, so not all of the motherboards of these two chipsets support PCIe 4.0. This should be paid attention to when purchasing.

If you really don’t know the motherboard chipset, you can take a closer look at the description of the motherboard’s storage interface when you buy it. We use ASUS TUF GAMING B450M-PRO S and ASUS TUF GAMING B550M-PLUS (WI-FI). Let me give you an example.


It can be clearly seen that if the chipset supports PCIe 4.0, the description of the storage function on the product official website will show that it supports PCIe 4.0, just follow the description of ASUS TUF GAMING B550M-PLUS (WI-FI), and vice versa. B450M-PRO S does not, so this motherboard does not support PCIe 4.0, which means that if you use the third-generation Ryzen with this motherboard, you cannot use PCIe 4.0.

Some students have to ask: “The CPU supports PCIe 4.0, and the motherboard does not support PCIe 4.0, so PCIe 4.0 cannot be used. If the CPU does not support PCIe 4.0 and the motherboard supports PCIe 4.0, can the computer use PCIe 4.0?”

This answer is naturally no. As long as one of the CPU and motherboard does not support PCIe 4.0, then your computer cannot use PCIe 4.0. For example, use the second-generation Ryzen processor that does not support PCIe 4.0 to be compatible with B550 and X570 motherboards. Naturally, PCIe 4.0 is not needed.

In fact, most motherboards using Intel’s Z490 chipset already support PCIe 4.0, but because the tenth-generation Core does not support PCIe 4.0, PCIe 4.0 is still not available. It can only be used after the next-generation CPU supports it.

So in general, it’s not that you can use PCIe 4.0 if you have a PCIe 4.0 solid state. You need a CPU processor and a motherboard. This is the importance of an ecology. Have you got it?

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Digital Nomad

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