Does more RAM significantly decrease battery life?

Discussion in 'Buying Tips and Advice' started by pubwvj, Oct 23, 2005.

  1. pubwvj macrumors 68000

    pubwvj

    Joined:
    Oct 1, 2004
    Location:
    Mountains of Vermont
    #1
    I'm going to get a new PowerBook 15".

    I plan to order it with 1GB in one slot so that later I may add another 1GB in the second slot.

    The question is how much power does each 1GB stick of RAM consume? Is it significant enough to raise the heat load and increase power usage such that one would get noticeably less battery life? A portion of the question might even be if one had more RAM would the increase in system efficiency (less hard disk access for paging) result in improved power usage.

    I ask because with my PowerBook Pismo there is a noticeable difference in power consumption between having one 512MB RAM card vs two 512MB RAM cards installed.
     
  2. shadowmoses macrumors 68000

    shadowmoses

    Joined:
    Mar 6, 2005
    #2
    More RAM shouldnt effect your battery life, if anythng it may increase it as it will stop the HD from spinning up so much,

    SHadow
     
  3. crazzyeddie macrumors 68030

    crazzyeddie

    Joined:
    Dec 7, 2002
    Location:
    Florida, USA
    #3
    Exactly, and RAM has been getting more and more efficient. This is really a null issue, as more RAM theoretically takes more power, but the more RAM, the less time the hdd spends swapping data.
     
  4. Lucky8 macrumors regular

    Lucky8

    Joined:
    May 18, 2005
    #4
    I didn't notice any different before and after I added the 1GB RAM.
     
  5. chucknorris macrumors 6502a

    chucknorris

    Joined:
    Jun 28, 2005
    Location:
    Moscow, ID (No Kremlin here!)
    #5
    Me neither!
     
  6. gekko513 macrumors 603

    gekko513

    Joined:
    Oct 16, 2003
    #6
    This complicated article says that 512MB of DDR2-533 RAM draws ~2.7W of power during a moderate workload. That's more than the hard drive uses when reading or writing. Just ~0.5W during low usage, though.
     
  7. Demon Hunter macrumors 68020

    Joined:
    Mar 30, 2004
    #7
    I thought DDR2 was quoted at 1.8v? Is that just the average? Because DDR needs 2.5v...
     
  8. gekko513 macrumors 603

    gekko513

    Joined:
    Oct 16, 2003
    #8
    Maybe you're mixing volts and watts?
     
  9. Bear macrumors G3

    Joined:
    Jul 23, 2002
    Location:
    Sol III - Terra
    #9
    You're talking volts and the other poster was talking watts. Not the same thing at all.
     
  10. Demon Hunter macrumors 68020

    Joined:
    Mar 30, 2004
    #10
    Ah. I failed Electronics for a reason. :p
     
  11. debroglie macrumors 6502a

    debroglie

    Joined:
    Aug 19, 2004
    Location:
    Philadelphia, PA
  12. Flyinace2000 macrumors 6502a

    Flyinace2000

    Joined:
    Sep 28, 2004
    #12
    1.5 gb of ram here and i can squeeze (like no airport, BT, screen on the lowest setting, CPU on reduceD)
     

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