asus commence à activer limité pcie gen 4.0 sur les cartes mères de chipset amd 400 | techpowerup

ASUS commence à activer Limited PCIe Gen 4.0 sur les cartes mères chipset AMD série 400

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.

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AMD n'a apparemment pas bloqué explicitement PCIe gen 4.0 pour les anciens chipsets. Il a simplement suggéré aux fabricants de cartes mères de ne pas l'activer, car les nouvelles cartes mères de la série AMD 500 sont conçues selon de nouvelles spécifications de PCB qui garantissent l'intégrité et la stabilité du signal PCIe gen 4.0. ASUS veut laisser aux utilisateurs le soin de décider s'ils veulent la génération 4.0. Si leurs machines sont instables, ils peuvent choisir de limiter la version PCIe à gen 3.0 dans leurs paramètres BIOS. Entre autres choses, les spécifications d'AMD pour les cartes mères de chipset de la série 500 prescrivent des PCB avec plus de 4 couches, pour un câblage PCIe et mémoire optimal. De nombreuses cartes mères figurant sur la liste d'ASUS, comme le TUF B450 Pro Gaming, utilisent de simples PCB à 4 couches. 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)