1 Reply Latest reply on Jan 20, 2011 12:55 PM by komugi

    Samsung 470 SSD 256GB using 1.5 Gbps on 3.0 Gbps capable chipset

    komugi

      Currently, I am using a Samsung 470 SSD with a laptop, and while it seems to be running OK with Intel RAID Controller (with single drive). When I update to the latest version of Intel RST 10.xx drivers, it seems to drop the auto-negioation link of the SATA interface to 1.5 Gb/s instead of 3.0 Gb/s on this SSD

       

      Is there any way around this issue? It does overall affect the speed of the SSD.

       

      Model name: SAMSUNG 470 Series SSD
      Serial#: S0MTNEAZ900569
      Firmware: AXM0701Q
      RAID Controller: Intel ICH8M-E/ICH9M-E/5 Series SATA RAID Controller using drivers Intel RST 10.1.0.1008
      OS: Windows 7 Ultimate

       

      The red bench is version 8.6.2.1012 (Windows default) drivers and the blue is the RST 10.1.0.1008.  I've also tried the 9.6 version of RST, performance was identical to 10.1.0.1008.

      http://dl.dropbox.com/u/749647/samsungSSD-bench.pnghttp://dl.dropbox.com/u/749647/samsungssd-latestrst.png

        • 1. Re: Samsung 470 SSD 256GB using 1.5 Gbps on 3.0 Gbps capable chipset
          komugi

          After wayyyyyyyyyyyy too much formatting/reinstalling. Uninstalling  storage drivers, etc etc. I've finally figured out why it was dropping  me to 1.5 Gbps -- seems like that the RST drivers when installed on a  laptop it enables a feature to 'power save' -- Link Power Management  (LPM)

          The fix was to change in the registry
          HKLM\SYSTEM\CurrentControlSet\services\iaStorV\Par  ameters\Port0  (corrosponding port that you are having the problem with. Change the LPM  DWORD value to 0, and it'll disable the LPM and put it back into 3.0  Gbps intead of 1.5 Gbps.

          Posted for posterity's sake in case anyone ever have this same issue.

          Caused me over 24 hours of grief.