2 Replies Latest reply on Oct 14, 2011 10:52 AM by claudiu

    Xeon E5520 and Turbo Boost




      I have an Intel S5500HCV motherboard sporting 2 Xeon E5520 CPUs (2.26GHz). These CPUs support Turbo Boost up to 2.53 GHz but I haven't been able to unleash this hidden and elusive power of theirs.


      I'm using Windows Server 2008 R2 SP1 as operating system and I suppose I need to install a driver or something. The closest thing I've found was this: http://www.intel.com/support/processors/sb/CS-031038.htm but it says it only supports processors from the i5 and i7 families.


      Is there any way to put the Nehalem class of CPUs into overdrive? If so, how should I proceed?



        • 1. Re: Xeon E5520 and Turbo Boost

          Please keep in mind that the turbo boost technology will be used by the operating system, meaning that there are no drivers, basically the operating system will know when to use this feature, usually then the processor is in full load.

          Make sure that the Enhance Intel SpeedStep® Technology feature is disabled in the BIOS of the server board, because if it is enabled, it will force the processor to run slower in order to save power consumption, and this could cause the system not to use the turbo boost feature.

          • 2. Re: Xeon E5520 and Turbo Boost

            Thank you Adolfo, that makes things much clearer.


            Basically, the actualy clock of the CPUs can be seen in the Resource Monitor utility from Windows (CPU tab, Upper left "Maximum Frequency) and it never goes over 100% (as it should, when TurboBoosted). However, I did enable SpeedStep and as you stated, that is most probably the reason the OS doesn't take advantage of ITB.


            I will disable SpeedStep at the next maintenance cycle and see if there's any improvement.