Changing RAM in Deep Sleep?

Discussion in 'MacBook Pro' started by Haptic, Mar 24, 2011.

  1. Haptic macrumors newbie

    Jun 24, 2010
    After seeing the dreaded beach ball far too often, I'm ready to upgrade my 2010 MBP to 8GB of RAM, but with to the amount of stuff I have open at any given time, shutting down is a bit of a mission - it took me weeks to find a suitable window to restart for the upgrade to 10.6.6!

    Is it possible to replace RAM while my laptop is in Hibernate (using Deep Sleep ) without adverse consequences, or should I shut down first? i.e. is there any chance of something going wrong, or of OSX only recognising the new RAM after a hard reset?
  2. deadwulfe macrumors 6502a


    Feb 18, 2010
    You have trouble making time to reboot a computer, but no problem making time to open up the bottom of it to replace the RAM? Assuming you have time to open the package the RAM comes in, I'd recommend you also shut down the computer.
  3. SandboxGeneral Moderator emeritus


    Sep 8, 2010
    You should always shut down and unplug any electronics when opening them up and working on them. That includes MBP's and replacing their RAM.

    I don't want to try and imagine what would happen if you tried that while turned on [asleep].

    Don't forget about electrocution....

    Besides that, when a computer is asleep, it keeps the RAM active and stores the state there, so if you did take it out, you'd totally hose your sleep state, and Lord knows what else.
  4. /user/me macrumors 6502

    Feb 28, 2011
    Do it! you'll be fine. just make sure that you coat your hands in water too, and stand barefoot on a metal floor. Really? Ask yourself this question. Would you change the oil on your car while it was running? If the answer to this question is also yes, then go for it, and then we can witness natural selection at it's finest.
  5. Nermal Moderator


    Staff Member

    Dec 7, 2002
    New Zealand
    Deep sleep is when the RAM is copied to disk and the computer is then shut down completely.

    I'm not sure that it's possible to be electrocuted by a laptop battery.
  6. /user/me macrumors 6502

    Feb 28, 2011
    Really? you let me know how that works and i'll believe you.... It's stored electricity..
  7. Haptic thread starter macrumors newbie

    Jun 24, 2010
    To clarify, Deep Sleep writes the contents of RAM to the HDD, and then shuts the laptop down, so if I understand correctly, no current would be flowing. It's not the same as regular sleep!

    More information on Deep Sleep/Hibernate here: (enough to give me reassurance that I won't be electrocuted, but nothing about whether changing RAM in Deep Sleep will cause any system instabilities)

    Re: Deadwulfe's question, its not that I don't have the time to install the RAM, but that it usually takes me 30 mins to an hour to close all applications and documents in an orderly fashion so I can resume where I left off easily.
  8. laser71 macrumors regular

    Nov 29, 2010
    I inadvertently changed my ram and did the optibay mod (including switching boot drive to optibay port), while the computer was in a deep sleep.

    Not surprisingly, it crashed when i tried to boot it up. One hard reboot later and it was fine.

    I don't think you can avoid the reboot.
  9. GGJstudios macrumors Westmere


    May 16, 2008
    Just touch your tongue to the leads and see if it tingles! :D
  10. DoFoT9 macrumors P6


    Jun 11, 2007
    it depends on what sleep mode your machine uses. there is a deep sleep mode that still powers the RAM AND saves its contents to the hdd. pulling it out whilst doing that may cause more harm then good.

    ALSO - don't forget that on wake up, the RAM probably wont be checked for upgrades, if you upgrade say, from 4GB to 8GB, the OS will still only have 4GB allocated in the registry.
  11. GGJstudios macrumors Westmere


    May 16, 2008
    You've already spent that much time with this thread, so you could have done it by now. Besides, there's no way it takes 30 minutes to shut down all apps and documents "in an orderly fashion". Just select Shut Down and your Mac will do that for you, asking you if you want to save changes to any open documents. You can shut down, replace the RAM, reboot and reopen everything and be back to where you were in 30 minutes.
  12. Haptic thread starter macrumors newbie

    Jun 24, 2010
    Thanks DoFoT9, Laser71 and Nermal for your helpful responses. Guess I'd better grit my teeth and prepare for shut down then!
    And to the rest, thanks for the laughs.

    GGJStudios: If only it were that simple. Amongst other things, I'm usually working off a lot of (very disorganized) temporary holding documents, and like to have imposed some order on the chaos before each shut down so clutter doesn't accumulate. Reloading 100mb+ of browser tabs is not cheap in this part of the world either, so there's an incentive to take the time to reduce open tabs to the essential before restarting.
  13. fehhkk macrumors 6502a


    Jun 11, 2009
    Chicago, IL
  14. IBradMac macrumors 68000


    Jun 27, 2008
    Why is this question being asked? Come on guys...:rolleyes:
  15. GGJstudios, Mar 24, 2011
    Last edited: Mar 24, 2011

    GGJstudios macrumors Westmere


    May 16, 2008
    If you've modified any docs, you'll have an opportunity to save changes before shutting down. Also, you can easily open recent files from most apps.
    You can always select "Add Bookmark for These xxx Tabs" with a click of the mouse. You can also "Reopen All Windows from Last Session", if desired. There are very quick ways to save where you were and shut down in just a few minutes. 10.7 Lion will make this even easier with its Resume feature. Until then, you can probably find and use an app like Relaunch.
  16. Penguissimo macrumors 6502a


    Nov 17, 2009
    I'm guessing he lives in a country where broadband bandwidth limits are low and overage charges high. Australia perhaps?

    But yeah, OP, you really should just make the time to do this properly. You may also want to see about organising your workflow a bit more so that a kernel panic won't wreck your day ;)
  17. lpmusix macrumors newbie

    Sep 17, 2006
    Yes, but the voltage isn't high enough to generally cause a problem. This is why car batteries are 12V (the same as your laptop battery, at least in mbp's), versus a higher voltage. Yes you can still get a "tingle" if you lick the leads, but just touching your skin isn't going to do anything.
  18. QuarterSwede macrumors G3


    Oct 1, 2005
    Colorado Springs, CO
    My guess is that it would cause a kernel panic. I would definitely shut down, replace and reboot. Do it properly OP.
  19. squeakr, Mar 24, 2011
    Last edited: Mar 25, 2011

    squeakr macrumors 68000


    Apr 22, 2010
    Voltage is the least of your worries, it is amperage that kills, and a car battery has more than enough to fry someone many times over, not to mention it is DC which burns more severely and deeper than AC.
  20. squeakr macrumors 68000


    Apr 22, 2010
    I wouldn't recommend that anyone so this, but I have changed it out when in deep sleep (wasn't thinking and paying attention to what I was doing, and was terrified that I had shorted something possibly when I realized what I had done). I had properly grounded myself before starting to alleviate static discharge issues and nothing bad happened. I am still using it error free to this day (after several years). Once again, I would NOT recommend doing this to anyone.
  21. acfusion29 macrumors 68040


    Nov 8, 2007
    well, today's the day for you to get organized and save your stuff every now and then...

    what are you gonna do if your system unexpectedly crashes? (it happens)
  22. Macsavvytech macrumors 6502a


    May 25, 2010
    You should always have your computer connected to the wall when replacing parts reason is that you may have noticed some wall plugs have 2 prongs but computers always have 3 the reason is the third one is the earth so if you disconnect the earth then the static in the case cant discharge and you can fry your motherboard. That does however cover computers with three prongs most laptops dont have three prong connects (including the MBP) so for the MBP you should touch a piece of steel in the case before doing anything else to make sure you discharge the static, it is also a good idea to leave the computer for say 5 minutes to allow the capacitors to discharge. This of course just a precautionary measure to make sure you dont break your 1K plus laptop.
  23. gullySn0wCat macrumors 6502

    Dec 7, 2010
    That's probably the strangest thing I've ever heard. You should earth yourself by touching something metal.
  24. kushed macrumors regular

    Mar 13, 2011
    i have to ask this question..

    what all are you running? like i can even imagine running so much stuf that you cant shut your computer down!!
  25. innominato5090 macrumors 6502


    Sep 4, 2009
    don't take it bad but, if you need 30 minutes to close everything, you should reconsider your entire workflow. the key of a well-done (and fast) job is order.

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