ASUS beginnt mit der Aktivierung von Limited PCIe Gen 4.0 auf AMD 400-Chipsatz-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.

Offensichtlich hat AMD PCIe gen 4.0 für ältere Chipsätze nicht explizit blockiert. Es wurde den Motherboard-Herstellern lediglich empfohlen, dies nicht zu aktivieren, da die neueren Motherboards der AMD 500-Serie nach neuen PCB-Spezifikationen gebaut wurden, die die Signalintegrität und -stabilität von PCIe Gen 4.0 gewährleisten. ASUS möchte es den Benutzern überlassen, zu entscheiden, ob sie Gen 4.0 wollen. Wenn ihre Computer instabil sind, können sie die PCIe-Version in ihren BIOS-Einstellungen auf Version 3.0 beschränken. Unter anderem schreiben AMDs Spezifikationen für 500er-Chipsatz-Motherboards PCBs mit mehr als 4 Schichten für eine optimale PCIe- und Speicherverdrahtung vor. Viele der von ASUS gelisteten Motherboards, wie das TUF B450 Pro Gaming, verwenden einfache 4-Lagen-Leiterplatten.

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)