Ram Help Noob question

Discussion in 'Mac Basics and Help' started by the_insider, May 29, 2005.

  1. the_insider macrumors regular


    Apr 20, 2005
    USA / UK
    I am going to buy a powermac 2.0 with 1 gig or ram (2x512) from the apple store. Is it ok if later i buy 1 gb ram sticks from apple, and put those into my computer. eg, 2x512 + 2x1gb?
  2. Abstract macrumors Penryn


    Dec 27, 2002
    Location Location Location
    Yeah, but you know what? Why don't you just buy all your RAM from a 3rd party vendor?

    See the 5 links above? (ie: Amazon, Amazon UK, MacMall, MacConnection, Crucial)

    Click on MacMall (aka: Other World Computing (OWC)) and buy your RAM from there.

    Its okay to get your RAM like that if you want to buy 2 x 1GB sticks later on, but I'd even go as far as saying to get your extra 512MB of extra RAM from somewhere else as well.
  3. wdlove macrumors P6


    Oct 20, 2002
    Purchasing RAM from a 3rd party vendor just depends on your comfort level with installing it yourself. I did it once with an older machine, no problem. A new Mac would cause me concern, however.
  4. Yvan256 macrumors 601


    Jul 5, 2004
    My main concern would be/is what type of memory to buy? I've heard/read that Macs need a "special" type of memory (exemple: I've seen "CL2.5" on my PowerBook's RAM stick), stuff that the usual PC stores don't carry.
  5. dmw007 macrumors G4


    May 26, 2005
    Working for MI-6
    The PowerMac G5s use Dual Channel DDR400 with a cas latency of 3.0.
  6. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    CL 2.5 refers to the CAS (Column Address Strobe) Latency of the RAM, it's a measure of how quickly the RAM can "get back in the game" after executing an operation. This measurement is common to all RAM, and on DDR RAM can be 3.0, 2.5 or 2.0 (lower being faster) The value doesn't make any difference to the Mac's performance, as it happens.

    Dual-channel just refers to the fact you have to install two identical models as a pair when upgrading PowerMac G5s. It doesn't mean that the individual RAM modules are any different.

    There isn't special Mac RAM. That said, there are other settings on the RAM module that can make it compatible or not compatible with a Mac. These are the SPD settings, and you will never see these advertised as part of a specification. Some generic RAM will be compatible, some won't. Some Macs are more tolerant of variation (PowerMac G5), and some are very picky (iMac G5, Mini, Powerbook 15" 1 GHz and 1.25 GHz, 17" 1 GHz and 1.33 GHz.)

    So how do you tell by looking if a piece of RAM will be compatible with a specific Mac? You can't. You have to rely on the seller.

    I recommend that you buy RAM from a reputable seller who tests and guarantees compatibility with your specific model of Mac, and offers a lifetime warranty.

  7. JzzTrump22 macrumors 65816

    Apr 13, 2004
    New York
    Get your ram from somewhere else, Apple is a complete rip off with their prices on ram. 512 is $300!!! Thats rediculous!
  8. the_insider thread starter macrumors regular


    Apr 20, 2005
    USA / UK
    Yeah, ok, but will it work if i have 2 512's, then 1 1gb ram card, or even 2 1gb ram cards?
  9. wordmunger macrumors 603


    Sep 3, 2003
    North Carolina
    You must install them in pairs, but the pairs can be any type: 2 X 512, 2 X 256, 2 X 1g

    Go to Crucial and use the memory adviser. This will tell you the type of memory you need. Most reputable sites have something like this -- this is the best way to determine what you need.

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