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Thread: Intel Core i7 3960X Sandy-E Takes Big Dive On Linux

  1. #11
    Join Date
    Aug 2007
    Posts
    6,621

    Default

    nice box, how fast does your cpu run now and which cooler do you use?

  2. #12
    Join Date
    May 2012
    Posts
    1

    Default 1 question

    Could it have anything to do with the cold boot?

  3. #13
    Join Date
    Jun 2012
    Posts
    3

    Default

    I'm having a hard time overclocking this chip on Linux, I have to disable speedstep otherwise it seems the turbo never kicks in, and overclocking on Sandy Bridge-E is done through the Turbo! Since a /proc/cpuinfo | grep MHz returns 3299.992 no matter what I do with speedstep disabled I'm basically having to refer to Windows overclock temps to see what is happening even though it's the same overclock - http://i.imgur.com/5UAXz.png

    On the Windows OC I had speedstep and all C States enabled, but no power management through Windows. This let the chip idle @ 1.2GHz through C State and on load all cores were at 100x42 for a 4.2GHz overclock.

    On Linux, the same settings stopped the turbo kicking in at all, as my cpuinfo grep always returns 3299.992 I had to use temps to see what was happening. With speedstep enabled and without having any frequency scaling set up in Linux (cpufreq/cpupower) I was getting temps a good 15C lower which seemed to indicate a lack of turbo. By disabling speeedstep I saw my temps correlate to the Windows overclock. Whether I'm Idling @ 1.2GHz within Linux is anybody's guess, I've absolutely no way of knowing. but it would be nice :/

  4. #14
    Join Date
    Aug 2012
    Posts
    2

    Default Any news on this bug?

    Hi

    I am planning to purchase the processor discussed here (Intel Core i7 3960X "Sandy Bridge" E) and would like to run Ubuntu 12.04, but I am really worried about the bug. Does anybody know whether this bug has been confirmed or resolved?

    Thanks a lot!

    Daniel



    Quote Originally Posted by phoronix View Post
    Phoronix: Intel Core i7 3960X Sandy-E Takes Big Dive On Linux

    While the thousand-dollar Intel Core i7 3960X "Sandy Bridge" Extreme Edition processor can build the Linux kernel in under 60 seconds, this morning it took a nasty dive under Linux...

    http://www.phoronix.com/vr.php?view=MTAyNzE

  5. #15
    Join Date
    Mar 2008
    Posts
    208

    Default

    I had some serious serious bios issues with the 3930k system I built. Back in february/march I finally got a bios which allowed the system to boot cleanly every single time. I'm guessing the problems are related to ram compatibility with the memory controller.

  6. #16
    Join Date
    Aug 2012
    Posts
    2

    Default

    bnolsen,

    thanks for your reply. Do you think that the new bios resolved the issues, so that now it should be safe to buy such a system?

    The reason that I am asking is that I found a thread on the Intel forum which discusses a similar issue ( http://communities.intel.com/message/162695#162695 ). There, the problem seems to have been solved when a new bios update came out.

    Quote Originally Posted by bnolsen View Post
    I had some serious serious bios issues with the 3930k system I built. Back in february/march I finally got a bios which allowed the system to boot cleanly every single time. I'm guessing the problems are related to ram compatibility with the memory controller.

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