AMD explained when the transition to PCI Express 4.0 will provide performance gains
Having presented at the end of winter the Radeon VII graphics card based on 7-nm graphics processor with Vega architecture, AMD did not give it support for PCI Express 4.0, although related Radeon Instinct computing accelerators on the same graphics processor previously implemented support for the new interface. In the case of the July updates, which AMD management has already listed this morning, support for PCI Express 4.0 received everything from 7-nm ryzen and EPYC processors to graphics cards Radeon RX 5700 and a set of logic AMD X570. By the way, in a slightly delayed publication of a press release on its own website, the company clarified that all five processors of the Matisse family presented on July 7 will support 24 PCI Express 4.0 lines, regardless of the price category.
Of this number, 20 lines can be used to connect video cards, drives, or other devices, and four PCI Express 4.0 lines are used to communicate with the AMD X570 logic set. The latter, in turn, supports 16 PCI Express 4.0 lines. Accordingly, the entire platform together provides support for 40 lines PCI Express 4.0, as indicated in the table from the press release of AMD.
The company does not hesitate to explain in which cases the transition to the use of PCI Express 4.0 is justified in our days. In the first place on the relevance are solid state drives with PCI Express 4.0 interface, which will soon be offered by the brands Galaxy (GALAX), Gigabyte (AORUS) and Phison. Latest and provided the AMD for testing the prototype drive Phison PS5016-E16 volume two-terabyte NVMe Protocol and PCI Express 4.0.
According to the footnote to the press release, the speed increase by 42 % compared to the drive with PCI Express 3.0 interface demonstrates such a drive in the test application Crystal DiskMark 6.0.2.
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