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GPU-Z Bus Interface Reporting

S

stahlhart

Super Moderator Graphics Cards
For a P67 motherboard, where running SLI sets the cards up as x8, is it normal for GPU-Z to report both of the cards/slots as PCIe 1.1?

The two slots I'm using are PCIe 2.0 x16_1 and PCIe 2.0 x8_3 (PCIe 2.0 x16 slot running as x8).

It was something I noticed when installing the 275.33 drivers last night. I would have thought that the slots would continue reporting themselves as 2.0. What appears to happen with GPU-Z is that the slot will initially report as 2.0, but then after a few seconds switches to 1.1.
 
After reading this I went ahead and checked as well and I see the same
behavior. However, as soon as I fire up a game and actually make the GPU
work, GPU-Z goes back to reporting it as 2.0. I guess all is well.
 
I appreciate your checking this; thanks much... welcome to the forums, too.

What actually happened that alarmed me was that it was Windows that spoke up first, not GPU-Z... in the process of installing 275.33, I got a message in the lower-right corner that the GPU was installed in a low-performance slot, and that I should move it (them?) to a better one. I'd never seen that message before, and I haven't moved the cards since I built the system new. I rolled the drivers back to 270.61, and then 260.44 (the ones came with the cards) and didn't get the warning either time.

I ran Vantage with the cards in SLI, and am still getting the same approximate score I always have (around 39K), so mabye there's no issue at all here to be concerned about. But it was just weird getting that Windows warning about the slot bandwidth.
 
Okay, here's what I'm not getting -- I'm just running on one card now, in the first slot. Why are the card and slot negotiating down to 1.1 from 2.0?

gpuz560.jpg
 
Aaaaaand it's a non-issue after all. Appears to be some sort of power management function in the drivers -- if I set up a game windowed, I can see both cards negotiating back up to 2.0 x8 in GPU-Z when 3D kicks in. I guess I just panicked unnecessarily when Windows spoke up about the degraded slot that one time (still wondering about that, though).

Anyway, just ignore me -- carry on. :whiste:
 
If desired, you should be able to stop switching to the lower mode through Control Panel > Power Options > Advanced Settings > PCI Express > Link State Power Management

Oh, yeah, and Edit button FTW!
 
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