PCIE1 slot being read as PCIE3... how can I fix this?
I plugged my graphics card into the PCIE1 slot, but it comes up as PCI Bus 3 under Device Managers. I somehow believe this is messing with my crossfire configuration as it supposedly is reading both cards under x16/x16 (according to GPU-Z), but the drivers aren't agreeing with it? I'm not sure, but I've been stuck with an unbearable stuttering issue with these cards under crossfire + eyefinity, so I'm hoping this might solve the issue.
Also related, is there any way to manually configure how many lanes the graphic cards take up?
Thanks, any help would be much appreciated.
Posted Feb 12, 2012, 5:58 PM UTC
32
I don't have an answer, but I have a clarification:
Physical slots don't correspond to internal lanes. Your mobo says PCIE1 because if it read PCIE3 there'd be a lot of confusion for end users. Other internal devices like sound or ethernet controllers often consume a bus lane or two.
Lane numbering discrepancies between the pcie controller and your mobo's printed labels are not the problem. Usually drivers are attributed to poor multiGPU performance, sometimes you might need one that's not release-ready or an older one that worked better. I'm no expert on that kind of stuff, though, so it could be something else. But I'll at least wager that PCIe lane numbering doesn't factor into this.
I would look at drivers aswell.
I agree that the Lane numbers are not going to be a factor in your multiGPU performance. Additionally, I don't believe you can change this, since I believe it's just reporting information from the northbridge (this is referring to the physical lines laid on the board, their placement relative to everything else on the motherboard - so the only way to change this is to change the mobo).
Try different drivers, even older ones to try to resolve the issue first.
Try disabling eyefinity and use only one GPU, etc etc. keep trying different combinations, you'll get there OP.