ASUS započinje omogućavanjem ograničenih PCIe Gen 4.0 na matičnim pločama serije AMD 400 serije

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 očito nije blokirao PCIe gen 4.0 za starije čipsete. Proizvođačima matičnih ploča jednostavno je sugerirano da to ne omogućuju, budući da su novije matične ploče serije AMD 500 ugrađene u nove PCB specifikacije koje osiguravaju integritet i stabilnost signala PCIe gen 4.0. ASUS želi to prepustiti korisnicima da odluče žele li gen 4.0. Ako su njihovi strojevi nestabilni, u svojim BIOS postavkama mogu ograničiti verziju PCIe na gen 3.0. Između ostalog, AMD-ove specifikacije za matične ploče serije 500 postavljaju PCB-ove sa više od 4 sloja, za optimalno ožičenje PCIe i memorije. Mnoge matične ploče na popisu ASUS-a, poput TUF B450 Pro Gaming, koriste jednostavne četveroslojne PCB.

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)