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IBM T40 Memory upgrade PC3200?

Discussion in 'IBM Thinkpad' started by samiroma, Dec 9, 2005.

  1. samiroma

    samiroma Guest

    I currently have a Ibm t40 1,5mhz centrino which has two 256mb DDR
    pc2100 modules. I wanted to remove them both and replace them with 1gb
    module. The question is, if I increase speed of the memory would it
    benefit the overall performance? I know DDR pc2100 266mhz works on my
    system. And I read that someone made a DDR pc2700 333mhz work on his
    T40. But what about DDR pc3200 400mhz? In theory since the system board
    has a 400mhz FSB wouldn't it make sence to upgrade to a pc3200 400mhz
    memory? Has anyone tested that? Would it work?

    Let me know what you think. I can't make up my mind and don't want to
    waste money getting a 1gb pc3200 just to find out it doesn't work :-(.

    Best to all.
    samiroma, Dec 9, 2005
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  2. You won't get perfomance improvements unless the chipset can run at
    that memory bus. Yours is a 855PM I believe which is 333/266 only. The
    good news is the ram should downclock to 333 or 266 if it can't work at
    400. However IBM/Lenovo seem to be pickier then Dells or Toshibas.

    Also you are confusing System FSB and memory bus. They are seperate. P4
    CPU fsb can be 400, 533, 800 vs the ram FSB wich can be 266, 333, 400
    (800/1066 on rdram desktops).

    smashedbanana, Dec 9, 2005
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  3. Probably not
    Check on www.ibm.com
    There is a chart
    Some models can not even use PC2700
    Bruce Markowitz, Dec 10, 2005
  4. samiroma

    Tony Hwang Guest

    Memory timing is based on FSB speed. Memory module does not control it.
    Tony Hwang, Dec 10, 2005
  5. Nope, also based on the makers specs. IBM's are specific as to what
    can be used,
    Bruce Markowitz, Dec 17, 2005
  6. samiroma

    Tony Hwang Guest

    Very funny, is there anything with no specs.?
    Tony Hwang, Dec 21, 2005
  7. You miss the point, some systems can only run with certain memory i.e.
    T20-T22 can only use PC100, NOT PC133, even though you would think it
    would just run the memory at the lower speed.
    so if the maker has not spec'd the machine to run with the faster
    memory, it simply may not do so, no matter what you think it should
    Bruce Markowitz, Dec 23, 2005
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