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    ID #1008

    I can't get your PC100 DIMMs to work in my older Pentium computer?

    SDRAM was initially introduced as the answer to all performance problems, however it quickly became apparent that there was little performance benefit and a lot of compatibility problems. The first SDRAM modules contained only two clock lines, but it was soon determined that this was insufficient. This created two different module designs (2-clock and 4-clock), and you needed to know which your motherboard required. Though the timings were theoretically supposed to be 5-1-1-1 @ 66MHz, many of the original SDRAM would only run at 6-2-2-2 when run in pairs, mostly because the chipsets (i430VX, SiS5571) had trouble with the speed and coordinating the accesses between modules. The i430TX chipset and later non-Intel chipsets improved upon this, and the SPD chip (serial presence detect) was added to the standard so chipsets could read the timings from the module. Unfortunately, for quite some time the SPD EEPROM was either not included on many modules, or not read by the motherboards. The issue is that the older motherboards are not compatible with todays PC100 and PC133 DIMMs and older DIMMs will need to be purchased for these boards. We carry these as 32M-PC66 and 64M-PC66.

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    Last update: 2004-04-09 17:05
    Revision: 1.0

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