13 Replies Latest reply: Aug 9, 2008 11:27 PM by Courcoul
yatesr Level 1 Level 1
I have a MacBook Pro 2.4. I noticed recently that some companies are now making 800Mhz ram, PC2-6400 DDR2.
1. Since my MBP has a bus speed of 800Mhz, can I upgrade to the new RAM and get a performace benefit?
2. If so, will my MBP recognize it without some kind of reconfiguration?


MacBook Pro 2.4ghz, Mac OS X (10.5.2)
  • Billydelp4 Level 1 Level 1
    im curious to know as well.
  • Allan Jones Level 7 Level 7
    Can you post a link to that specific RAM so people can review the specs??
  • Smerky Level 1 Level 1
    Kinston's line of PC2-6400:


    Neither of them specify if it would be directly compatible with your MBP. I'm going to call Crucial tomorrow to find out what they say since I'm interested in knowing myself.
  • Smerky Level 1 Level 1
    I did an online chat with a rep from Crucial and they said that the current MacBook Pro can not handle the speed of the PC2-6400. That's rather unfortunate.

  • Courcoul Level 6 Level 6
    Well, as a consolation, if you have a new generation MBP, you can always use the new 4GB 667 DIMMs. You won't get the high speed, but you will get 8 whopping GB of RAM in there...

    There was an article in here awhile back, where someone reported results of testing the new big DIMMs on the Feb'80 MBP and confirming that the system was successfully able to handle the full 8GB, although this is not officially supported by Apple. The Penryn is really a dual 32/64 bit processor.
  • Billydelp4 Level 1 Level 1
    i thought all the intel processors were both 32/64 bit? I was told by an apples specialist at the store that mine had a 64 bit processor running a 64 bit OS with leopard. Was he wrong? I am July 07 so the Santa Rosa model 2.2
  • Smerky Level 1 Level 1
    They are dual....Why are you confused? Nobody said anything about them not being dual 32/64 bit.
  • Richard Pini Level 1 Level 1
    Hm. In the system profiler for my MBP (2.5 GHz Penryn, bought mid June) it lists the bus speed as 800 MHz, though the 2 1-gig sticks are 667 MHz DDR2 SDRAM. If the bus speed is given as 800 MHz, I wonder why it would not handle 800 MHz memory?
  • Smerky Level 1 Level 1
    According to Crucial they claim that they tested with the current MDP but they say that the MDP does not support 800Mhz parts.
  • 3zzy Level 1 Level 1
    I've the latest MBP 17"(version 4,1), will it support 800 Mhz?

  • Courcoul Level 6 Level 6
    If the bus speed is given as 800 MHz, I wonder why it would not handle 800 MHz memory?

    [This pretty picture|http://developer.apple.com/documentation/HardwareDrivers/Conceptual/15i nMacBookPro0802/Articles/ProductDeveloperNote.html#//appleref/doc/uid/TP40007348-BCIGAACJ] will give you an idea of why the bus is 800MHz but memory has to run at 667MHz, until the supporting chipset gets upgraded to the Montevina platform, sometime later in this year. Same thing goes for [the 17 in MBP, Feb'08 edition|http://developer.apple.com/documentation/HardwareDrivers/Conceptual/17i nMacBookPro_0802/Articles/ProductDeveloperNote.html].
  • 3zzy Level 1 Level 1
    Erm..not really. The guy who tested 8GB RAM concluded:

    "Unfortunately after running the MacBook Pro for almost 24 hours, it isn’t looking good. One of the key scenarios for wanting to move to 8GB isn’t working worth a ****. I’m talking about virtualization.

    ...Assuming by pulling the memory out of the box, things settle down and perform properly, then Apple, VMWare, Parallels and Kingston have some work to do. At that point it would not be apparent if the 4GB sticks are in fact faulty, or OS X needs a fix, or Fusion and/or Parallels need a fix. This would certainly be out of my hands for any further testing."

    Wish it did work though.
  • Courcoul Level 6 Level 6
    Bummer... When I read the thread, he hadn't gotten to the bad part yet. But then, we are really getting just what we paid for: the current model MBP's are only supported with up to 4GB RAM. Apple and the others must be busily working, but on the next generation that will support 8GB and many other goodies.