My Gpu is running at x16 4.0 @ x16 2.0

[bruucee]

So is this normal? I have a Rtx 4080. During a render test on Gpuz the x16 2.0 will increase to 4.0 under load. Bios settings are set to auto for pcie settings. I also have a nvme m.2 card in the top slot right under the cpu. Is there any additional tinkering I need to do in Bios. Under auto there are speed settings of Gen 2-Gen 5. Not sure what that means. This is my first Pc build.

[76561198343548661]

GPU-Z sometimes can not correctly detect and report PCI-E generation . I ve seen it just showing question mark as far as i remember .

[Mailer]

I think that's pretty standard. The PCIe state drops during idle periods to save power. It's the "x16" that sometimes gets truncated by shared lanes between slots, but it depends on what motherboard and CPU combo you have.

[UserNotFound]

GPU-Z can be messed up at times, my laptop RTX 3070 140W is showing x8 2.0, so I know it's somehow reading the bus interface wrong....

[Illusion of Progress]

You can momentarily change your power plan from what I presume is balanced to high performance (or simply change the individual setting for the PCI Express in the power options) to check, but since it's going up under load, it sounds like it's working as intended.

[UserNotFound]

Oops, earlier, I'd run GPUZ wihtout plugging my lappy to the wall socket for power. Now, it shows up as PCIe x16 4.0 @ x8 3.0, that's fine because I don't think a mobile RTX 3070 can saturate the memory bus width of PCIe x8 3.0.

[DeadBeat]

Render Test

"Modern graphics cards come with extensive power saving features."

"One of these functions reduces the PCI-Express link speed & width to lower levels to conserve power when the card is idle." As @Mailer alluded to

"This is why you might see undesired values in GPU-Z's Bus Interface readout."

"If you click the button below a small render test will be started which should put the card in its highest power state, so you can verify proper PCI-Express speeds."

"Once the test is started look at the Bus Interface readout in the GPU-Z window to change within a few seconds."

"This is not a stress test."

[Bad 💀 Motha]

This is why its better to run benchmarks at comparible settings.
Then to sit there and look at the PCIE bus changing in GPU-Z.
As long as it switches to the max supported speed of both the GPU + Motherboard when under load, then there is not a problem.

[bruucee]

Thanks for the clarification. When researching this. I kept seeing that the top most m.2 slot, when in use would halve my GPU bandwith. I actually just made a change in bios. I changed the pcie speed from auto to Gen 4. And the gpu bandwidth changed from PCIE 4.0 x16 to Pcie 4.0 X8. So that threw me for a loop.

[Bad 💀 Motha]

When on auto it might dynamically change PCIE speed between PCIE X16 #1 slot and the #1 NVME M2 slot. That's normal and won't hurt anything.

Your SSD only needs the faster PCIE speed when doing long/heavy sustained writes.

[shakenstien]

Hey did u solve the problem? i'm facing the same issue

[Bad 💀 Motha]

引用自 𝕾𝖙𝖎𝖊𝖓：

Hey did u solve the problem? i'm facing the same issue

Where (or what app) did you actually test this in / at ?

[Iron Knights]

Run GPU-Z & Furmark for testing, Bandwidth is downsized when not in use.
Mine says 1.1 static but will run 2.0 (old PC). Don't worry about stat-ic-stics...