ASUS begynner å aktivere begrenset PCIe Gen 4.0 på AMD 400-serien Chipset Motherboards

ASUS believes that PCI-Express gen 4.0 support on older socket AM4 motherboards based on the AMD 400-series chipset is technically possible, even if discouraged by AMD. The company's latest series of motherboard BIOS updates that expose PCIe Gen 4 toggle in the PCIe settings, does in fact enable PCIe gen 4.0 to all devices that are directly wired to the SoC. These would be the PCI-Express x16 slots meant for graphics, and one of the M.2 slots that has PCIe x4 wiring to the SoC. Below is a list of motherboards scored by Chinese tech publication MyDrivers, which details the extent of PCIe gen 4.0 support across a number of ASUS motherboards based on the X470 and B450 chipsets.

AMD blokkerte tilsynelatende ikke eksplisitt PCIe gen 4.0 for eldre brikkesett. Det foreslo bare til hovedkortprodusenter å ikke aktivere det, siden de nyere AMD 500-serien hovedkort er bygget etter nye PCB-spesifikasjoner som sikrer PCIe gen 4.0 signalintegritet og stabilitet. ASUS ønsker å overlate det til brukere å bestemme om de vil ha gen 4.0. Hvis maskinene deres er ustabile, kan de velge å begrense PCIe-versjonen til gen 3.0 i BIOS-innstillingene. AMDs spesifikasjoner for 500-serie hovedkort for brikkesett foreskriver blant annet PCB med mer enn 4 lag, for optimal PCIe og minnekabling. Mange av hovedkortene på ASUS 'liste, for eksempel TUF B450 Pro Gaming, bruker enkle 4-lags PCB-er. To test that PCIe gen 4.0 is actually enabled, MyDrivers used a PCIe gen 4.0 SSD on the M.2 slot that's directly wired to the SoC, on a TUF B450M Pro Gaming. Crystal DiskMark sequential read speeds of the drive are consistent with the same drive tested on an X570 motherboard - with just over 5 GB/s reads. These speeds are impossible on gen 3.0 x4. In a separate article, MyDrivers reports that AMD isn't too happy with ASUS marketing PCIe gen 4.0 support on its 400-series motherboards, and is reportedly trying to block it in updates to the AGESA microcode. Our recommendation - if your updated ASUS 400-series motherboard is running PCIe gen 4.0, don't update its BIOS. Sources: MyDrivers (main story), MyDrivers (AMD's response)