The Notebook Review forums were hosted by TechTarget, who shut down them down on January 31, 2022. This static read-only archive was pulled by NBR forum users between January 20 and January 31, 2022, in an effort to make sure that the valuable technical information that had been posted on the forums is preserved. For current discussions, many NBR forum users moved over to NotebookTalk.net after the shutdown.
Problems? See this thread at archive.org.

    Super LFM?

    Discussion in 'Dell' started by darksiege, Mar 10, 2008.

  1. darksiege

    darksiege Notebook Consultant

    Reputations:
    0
    Messages:
    129
    Likes Received:
    0
    Trophy Points:
    30
    I've been testing around with the CPU speed on Vista's Power options as well as with RMClock. I noticed there is a Super Low Frequency Mode that was implemented, which allows the processor to run at a lower voltage.

    However, the multiplier I see when running Super LFM is at 8x as opposed to the lowest setting which is 6x. This raises the clock speed from lowest 1.2 Ghz to 1.6 Ghz. I notice if I limit the processor speed through Vista's power settings, the lowest setting is considered to be the Super LFM one which runs at 1.6 Ghz. RMClock reports this speed to be at 800 Mhz however, but CPU-Z reports it at 1.6 Ghz :confused:

    Does anyone have any info on these settings and which one will save the most power?
     
    darksiege, Mar 10, 2008
    #1
  2. lqaddict

    lqaddict Notebook Consultant

    Reputations:
    6
    Messages:
    132
    Likes Received:
    0
    Trophy Points:
    30
    My blind guess is that RMClock reports it per core, whereas CPU-Z per processor.
     
    lqaddict, Mar 11, 2008
    #2
  3. darksiege

    darksiege Notebook Consultant

    Reputations:
    0
    Messages:
    129
    Likes Received:
    0
    Trophy Points:
    30
    But they both report the same speeds in all other cases with standard 1V Voltage (ie. 1.2 Ghz at 6x, 1.6 Ghz at 8x, 2.0 Ghz at 10x, 2.4 Ghz at 12x). The Super LFM uses something like 0.925V.
     
    darksiege, Mar 11, 2008
    #3
  4. reidy-

    reidy- Notebook Enthusiast

    Reputations:
    0
    Messages:
    42
    Likes Received:
    0
    Trophy Points:
    15
    super LFM = super low frequency mode?

    512k pi @ SuperLFM took 29s
    512k pi @ 1200mhz took 16s

    so we can safely assume that SLFM is .8Ghz and is just reported wrongly by CPU-z

    I presume that there are other powersaving 'things' happening as the times are roughly in a 1:1 ratio but the change in core speed isnt.
     
    reidy-, Jan 8, 2009
    #4