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From the perspective of motherboard manufacturers, they are obviously willing to let the 400 series motherboards also support PCIe 4.0. The new version of the AM4 platform BIOS released by ASUS has unlocked PCIe 4.0 support for the 400 series motherboards, but only the first PCIe x16. Slot and first M.2 slot.
ASUS's 6 X470, 13 B450 upgrades, with three generations of Ruilong, can also open PCIe 4.0, TUF B450M-PRO GAMING motherboard measured PCIe 4.0SSDThe same can run more than 5.0GB / s, 4.2GB / s continuous read and write speed, and the X570 motherboard is no different.
This is a benefit for the 400 series motherboard users, but don't be too happy.AMDThe official today issued a statement that once again expressed a negative attitude towards the support of PCIe 4.0 on 300 and 400 series motherboards, AMD said:
"Our plan has not changed. As previously stated at the Taipei Computer Show, due to reliability and consistency, we plan to disable PCIe 4.0 on the motherboard before the X570 chipset, and the AGESA code will be sent to the motherboard manufacturer."
From the point of view of AMD, they believe that only the X570 chipset specially designed for PCIe 4.0 can support PCIe 4.0 without any worry. This is their official recommendation, and the 300 and 400 series chipsets even open PCIe. 4.0 support,This feature will also be disabled in future BIOSes, and AMD will not open this feature to vendors.
For motherboard users of 300 or 400 series, if you want to experience the thrill of PCIe 4.0, don't upgrade after upgrading the current BIOS, otherwise the function will be removed.
As for whether the 300 and 400 series have the stability and consistency problems that AMD is worried about, there are no examples or tests. It is difficult to say whether PCIe 4.0 on the motherboard before X570 is unreliable or reliable, and players have to bear the cost of early adopters.