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PCI-e lane stuck in x8 after installing CCC 11.4

post #1 of 7
Thread Starter 
Both my PCI-e lanes were at x16 using 11.2 drivers, I tried 11.4 and it dropped one of my lanes to x8

Someone else reported the same problem and reported fixing it by reverting back to 11.2, so I did, but my lane is still stuck in x8

I have done everything possible except a format to fix this, I have used numerous crap cleaners, manually removed every last trace of anything AMD / ATI from everywhere, reinstalled 11.2 many times, but nothing will recover my PCIe lane back to x16

I have 2 x 6850s in an ASUS M3A32-MVP-Deluxe mainboard

I have 100% got the cards in the correct slots, treble checked everything

The lane stuck in x8 is the top slot, the main card (They are running in XFire)


Please can someone advise me what I can do, or where I can find the offending file / entry that is stopping x16 ?


Thanks
post #2 of 7
Does it even matter? I thought there was no performance difference between x8 and x16.
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post #3 of 7
Reseat the cards and clean the contacts on them. Try booting with a single card in the top slot, verify it is x16, and then add the second one after shutting down.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
Reseat the cards and clean the contacts on them. Try booting with a single card in the top slot, verify it is x16, and then add the second one after shutting down.
Ok well I had already removed the cards and swapped them over, but I am now booted up with the top card only and it is still stuck in x8
post #5 of 7
Quote:
Originally Posted by magicdave26 View Post
Ok well I had already removed the cards and swapped them over, but I am now booted up with the top card only and it is still stuck in x8
Are you using GPU-Z to check the lanes? If so, what version?
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post #6 of 7
Thread Starter 
Quote:
Originally Posted by Dopamin3 View Post
Are you using GPU-Z to check the lanes? If so, what version?
Yes 0.5.1 latest version, Its ok after all that I reset my BIOS to an Overclocking profile I had made when I only had the one card and it was back to x16, put my other card back in and both are back to x16

Question is though, why would installing 11.4 do anything to my BIOS, or do anything that loading a new profile in my BIOS would fix ?

There are 3 options in my BIOS

peer to peer among gfx/gfx2
gfx dual slot configuration
gfx2 dual slot configuration

Im slightly confused which should be enabled for CrossFireX best performance ?

The 1st one I would imagine would need to be enabled
the 2nd one too if I am only using 2 cards ?
and the 3rd if I was using 4 cards ?
Edited by magicdave26 - 3/11/11 at 11:09am
post #7 of 7
PCI-E sound card?
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