533Mhz DDR2 SODIMM in MacBook

Discussion in 'MacBook Pro' started by imac9556, Apr 7, 2007.

  1. imac9556 macrumors 6502a

    Jul 12, 2004
    I have a 2.0Ghz MacBook Core 2 Duo Notebook. It originally came with 1GB (2x512) DDR2 667Mhz Memory. However, I had some old memory from my old notebook that used DDR2 533Mhz SODIMM Memory. I used those 2 1GB SODIMMS to upgrade to 2GB of memory. However, after 5 Months, I did not realize until now that the memory is 533Mhz, not 667Mhz. Does it make that much of a difference I am using 533Mhz memory? Will I notice a difference if I were to get 667Mhz memory instead? It is working perfectly with 2GB of DDR2 533Mhz SODIMM memory, but am I holding my system back alot?
    Thanks, Paul
  2. amt8 macrumors newbie

    Mar 31, 2007
    New Jersey
    RAM Bottleneck

    When you have one module of RAM's speed at one set value of MHz and you only have another module of RAM, but that other module has a lower speed, your system will only be able to run at that lower module's speed. It's like a weakest link in a chain principle. Your computer will bottleneck and only run at the lower speed.

    In your case, your system will run as if both are 533 MHz modules.
  3. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    Well, all of your memory operations are running 20% slower so yeah, it has an impact.

    OTOH, if you're happy with the performance, it's probably running a smidgen cooler as well.
  4. imac9556 thread starter macrumors 6502a

    Jul 12, 2004
    Yeah, both are identical samsung chipset memory modules...I guess I might sell them and get a faster rated memory chips...Anyone looking for 1GB Samsung Chipset 533Mhhz DDR2 Memory? :)
    Thanks everyone for your help!

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