I built my PC a couple of months ago, and while it's been running smoothly, I just checked GPU-Z and noticed something odd with my RTX 5080. The bus width is displaying as "pcie x 16 5 @ x 16 5.0," even though it's connected through a Gen 4 riser cable in my small form factor (SFF) build. I thought I might need to set the PCIe settings to Gen 4 in the BIOS on first boot because of the riser, but it worked fine on auto. Now, I'm curious if leaving it on auto in the BIOS could cause any issues or if I'm missing out on performance.
2 Answers
It really depends on the quality of your riser cable. Some can handle the PCIe 5 signal, while others may only be suitable for PCIe 3 speeds. If you don’t face any problems currently, you could just leave it as is. But if you start seeing performance issues or crashes during gaming, it might be worth changing to Gen 4 in the BIOS and see if that fixes it.
You might run into some issues down the line with certain high-demand applications, especially if you're pushing your GPU hard in 4K gaming or ray tracing. The cable could be fine, but some users have reported problems when trying to utilize the full bandwidth. If everything’s working smoothly for now, you should be okay, but just keep an eye on performance during intense tasks.
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