1 Reply Latest reply on Oct 7, 2015 7:34 AM by dns.on.gpu

    PCIe speed problem

    dns.on.gpu

      Hello.

       

      This is probably an AMD question.

       

      I have a X79 mobo with a R9 280X card on the first slot (pcie 2/3 possible),

      and two disks.

       

      One disk (hdd) has opensuse 13.1 and the default opensuse driver.

      When checking with lspci -vvv I get

       

      LnkCap: Port #0, Speed 8GT/s, Width x16

      LnkSta: Speed 8GT/s, Width x16

       

      which is great.

       

      On the second disk (ssd) I have ubuntu 14.04 and fglrx 15.10.1013 and

      lspci gives

       

      LnkCap: Port #0, Speed 8GT/s, Width x16

      LnkSta: Speed 2.5GT/s, Width x16

       

      This is pcie-1 speed. This speed remains unaffected if I switch off

      the pci-3 option in the bios.

       

      Is there a fix for the ubuntu problem?

       

      Thanks.

      --

        • Re: PCIe speed problem
          dns.on.gpu

          Hello again.

           

          Made two clean installations - one with Ubuntu 14.04 and another with OpenSuse 13.1.

           

          Before installing AMD drivers both installation show pcie speeds 8GT/s.

           

          After the installation of the AMD latest drivers the pcie speed drops to 2.5GT/s.

          That is pci-1 speeds.

           

          It looks like a driver problem. Is anyone in AMD remotely interested in this?

          --