Old 03-10-03, 10:50 AM
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I have a IBM Thinkpad 600E model 2645-4BU. Right now I have 128 mb of total memory and I would like to upgrade to the max, which for my computer is 288mb. I need to get 2-128mb chips, but the problem is IBM website says I need the pc66mhz and the Viking Memory Configurator says I can use pc100 (part I0296) which they say is comparable to the IBM memory 01K1150 (which is the pc660). I would just like to know which one I can use.

Also, in my computer currently is one 32 chip and one 64 chip. The 32 chip actually says pc100 on it.

Old 03-10-03, 01:29 PM
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Usually pc memory is backward compatible, SDRAM. That is pc100 will run at 66 mhz. However, some motherboards are critical as to the brand and type of memory needed. has a memory configurator that may confirm your current findings. It may be that pc100 memory is more popularly produced and more readily available than pc66 memory. The availability and cost may make the pc100 a better deal.
Old 03-10-03, 07:08 PM
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What chfite really said was:It may very well be that your computer can function fine with the pc100, but it will only run at the pc66 speed. As such, you would be paying for value/speed that you cant use, so unless the pc100 is cheaper than the pc66, stick with the manufacturer's recomendation. Go here to check compatability at crucial:

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