Memory question, just received upgraded memory from OWC

Discussion in 'iMac' started by pdxa4, Aug 4, 2008.

  1. pdxa4 macrumors 6502

    Aug 4, 2008
    Hi there,
    I have a new 24" iMac 2.8Ghz which we just recently purchased. Loving it so far and it is our first Mac...

    This unit comes with 2GB 800Mhz RAM memory. As I have also got Aperture I found performce to slow down a bit, so I ordered from OWC their Samsung 4GB upgrade of PC6400 DDR2 memory which was clearly listed as 800MHz.

    So I just received the memory in the mail today, and I read the sticker on the memory which says the following...
    2GB 2Rx8 PC2-6400S-666-12-E3 and M470T5663QZ3-CF7 0813

    I did not take the memory out of the packaging

    From a web search that i did it looks like these memory units are at 666MHz, not the 800MHz that I should have been sold...

    I just sent a email onto OWC to their sales dept (too late to call them), and I hopefully will hear from them tmrw.

    I just wanted to be on top of the details and to check in with the experts on this forum. What is your opinion of the above ? Is there a 800MHz version of the Samsung memory, or has anyone else ran into a similar issue with OWC before ?

    Many thanks everyone...:apple:
  2. zackkmac macrumors 6502a

    Jul 7, 2008
    PC2-6400 should be 800MHz, because 667MHz is the speed for PC5300. Also I just googled PC2-6400 and came up with a lot of "800MHz" so that should be 800MHz RAM :)
  3. CanadaRAM macrumors G5


    Oct 11, 2004
    On the Left Coast - Victoria BC Canada
    Numbers - yer reading them wrong


    PC2 means DDR2

    6400 means 6400 Mb/sec bandwidth / 8 bits per byte = 800 MHz memory

    666-12 means latency values of 6-6-6-12
    Sometimes abbreviated as CAS Latency 6 or CL6 (CAS - Column Address Strobe - is the first and most important of the latency values)

    This RAM is fine for your iMac.
  4. pdxa4 thread starter macrumors 6502

    Aug 4, 2008
    Thanks to both of you for your great response.
    I just wanted to get a good backround check.
    Good news then on the memory. I will install it tmrw evening.
  5. alphaod macrumors Core


    Feb 9, 2008

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