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Multi-CPU - can't switch off?

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  • midflight

    • Nov 2007
    • 12

    Multi-CPU - can't switch off?

    Hi,

    A query about batch-encoding:

    When using the multi-encoder (say to convert from WAV to FLAC & MP3 at the same time) I get the option to select "Multi-CPU" on or off.

    But when using a single-encoder (eg converting from FLAC to MP3) I don't get the option, and it defaults to trying to encode using Multi-CPU... even though I only have one CPU!?

    Is this normal?
  • LtData
    dBpoweramp Guru

    • May 2004
    • 8288

    #2
    Re: Multi-CPU - can't switch off?

    What CPU do you have? Do you have two CPU graphs in Task Manager?

    Comment

    • midflight

      • Nov 2007
      • 12

      #3
      Re: Multi-CPU - can't switch off?

      Sorry, you might be right.

      I have a Dell Dimension 5150, which is not dual-core. I assumed this meant it does not have 2 x CPUs, but in Task Manager I do indeed have 2 x CPU graphs...

      Comment

      • LtData
        dBpoweramp Guru

        • May 2004
        • 8288

        #4
        Re: Multi-CPU - can't switch off?

        You probably have a Hyperthreaded Pentium-4, which is one CPU and one virtual CPU.

        Comment

        • midflight

          • Nov 2007
          • 12

          #5
          Re: Multi-CPU - can't switch off?

          OK, thanks. Interesting - a virtual CPU. How is that done? Using RAM?

          Anyway, in that case, is it best to have the multi-cpu option switched on or off?
          Or won't I notice much difference?
          (I can't test it, as it won't let me switch it off)

          Comment

          • LtData
            dBpoweramp Guru

            • May 2004
            • 8288

            #6
            Re: Multi-CPU - can't switch off?

            See here for how Hyperthreading works: http://en.wikipedia.org/wiki/Hyperthreading
            As for speed, you would probably be better off with Multi-CPU on than off, but you could test this yourself to find out for sure if you use the Multi-Encoder codec, which lets you turn the multi-CPU on or off.

            Comment

            • Spoon
              Administrator
              • Apr 2002
              • 44579

              #7
              Re: Multi-CPU - can't switch off?

              Just intel marketing...
              Spoon
              www.dbpoweramp.com

              Comment

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