Strange thing about the new iMac

Discussion in 'Hardware Rumors' started by Catfish_Man, Jan 14, 2002.

  1. Catfish_Man macrumors 68030


    Sep 13, 2001
    Portland, OR
    I was looking at the doc posted a bit ago about how to take it apart and I noticed something strange.

    It uses both PC133 and PC100 RAM. I thought that you needed a 133MHz system bus to use PC133 RAM effectively, and I thought that if you mixed PC100 and PC133 it would run the whole thing at the speed of the slower memory. Am I wrong, or is this strange?
  2. Unregistered Guest

    Re: Strange thing about the new iMac

    It's an odd configuration in general, but I could see it as a way to get everything to fit. As for the whole thing running at the speed of the slower memory, it has a 100mhz system bus anyway, so running at the slower speed shouldn't make any difference as far as I know. I have two different speed DIMMs in my 600mhz iMac and I've never had any problems. Many chip suppliers were sending out PC133s, even when you order 100s, claiming that the 133s will work fine in place of the 100s.
  3. Falleron macrumors 68000


    Nov 22, 2001
    Will this be a cheaper way of getting memory for the imac?
  4. datalok macrumors member

    Jan 6, 2002
    well here in Aus 133 is cheaper than 100 and the difference is 133 is rated to run at that speed - most 100's can with no prob but since ram probs are a beatch to pin down it is best to use the 133 - imho
  5. kansaigaijin macrumors 6502

    Jan 7, 2002
    the great ether
    also that doc may be out of date, look for the real thing on Knowledge base
  6. gotohamish macrumors 65816


    Jul 15, 2001
    efficient ram

    I believe if you have a 100 bus, ram can fall short of it's mark:

    IE - PC100 ram can run at about 90, or 95 - thus lowering your bus speed. If you use PC133 and it runs slower, it's still running at more than 100 so you get full 100 bus speeds.

    I think...
  7. Buggy macrumors regular

    Oct 14, 2001

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