RTX 4090 compatible with PCIe 1.1 interface
RTX 4090 compatible with PCIe 1.1 interface
Hello! I recently installed a new PC two weeks ago after the Ryzen 7 7700X arrived, and now I have a Gigabyte RTX 4090 gaming OC that completely covers my motherboard. I upgraded from a R7 2700X with a GTX 1070. After just two days of gaming, I opened GPU-Z 2.50.0 this morning and found myself using a PCIe 1.1 x16 bus (confirmed by HWiNFO64 7.30). Initially, I thought Windows was exploiting an idle mode, so I ran a render test and a benchmark, but both still showed PCIe 1. I forced the bus to PCIe 5.0 in BIOS without changing the auto setting, yet nothing appeared on Windows. Could you help? The RTX 4090 likely isn’t severely limited by PCIe lanes in games, but since my main work involves software development and the project needs high bandwidth—especially with 24GB of VRAM—the performance gap is noticeable (4GB/s vs. 31.5GB/s theoretically). It’s not my first time troubleshooting, but I’m still stuck. Thanks ahead for your time!
Full specs: Asus TUF Gaming X670E-Plus Ryzen 7 7700X 2x 32GB DDR5 5600Mhz CL40 (EXPO) 2x 2TB Kingston NVMe SSD PCIe 4.0 Gigabyte RTX 4090 Gaming OC (Power limit @70% / 315W) Windows 11 Pro 22H2 22621.674 more: https://pcpartpicker.com/list/G9MRMb
Press the button next to the bus interface, it will apply maximum load to start it running at full speed.
This indicates the question mark is present because of @G-ZooM. It will launch a render test—just begin it and you’ll notice the reading updates.
@Eigenvektor previously attempted the render test and RDR2 benchmark, focusing on the Bus interface, but observed no movement. A retry a short while ago on Metro Exodus showed results below. The Hardware Monitor readings seem unusual—315W is typical since I capped it to prevent conflicts with my 850W PSU until the replacement arrives. Note: 105 FPS average across three sessions at 1440p Extreme with RTX Ultra, no DLSS used.
Asus launched a new BIOS (version 0805) for my motherboard aimed at enhancing GPU compatibility with the GeForce RTX 40 series. I’m unsure if this will fully resolve the problem, but since it’s in beta, I’m cautious about using it right now. I plan to test another GPU tomorrow to compare PCIe behavior. If it exceeds 1.1, I’ll update the BIOS.
The update successfully resolved several issues I encountered with AM5. It now switches between versions smoothly depending on hardware acceleration, and the render test completed as expected at version 5.0. I plan to revert to version 4.0 since it meets my needs. Additionally, the BIOS addressed problems like Eco mode malfunctions and the inability to show the BIOS interface on the PCIe GPU, which previously required connecting a second input. Thanks for your support!