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

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  • #11
    nice box, how fast does your cpu run now and which cooler do you use?

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    • #12
      1 question

      Could it have anything to do with the cold boot?

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      • #13
        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 :/

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        • #14
          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



          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

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          • #15
            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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            • #16
              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.

              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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