Demetri Kolokotronis wrote:
>To be sure I understand, if I have 133[MHz] RAM, and a 100[MHz] mobo,
>there is no harm, but I won't get more than 100[MHz] speed from the
>RAM? The system will not run well if I have one stick of 133[MHz]
>RAM, and one of 100[MHz], with a 100[MHz] mobo? [corrections]

Here are two cases where mixing PC100 and PC133 RAM might cause
problems. (Fortunately, each case should be easy to fix.)

(1) Suppose you put a PC133 module in the first DIMM slot and the
     PC100 module in the second DIMM slot. If the motherboard is
     such that it reads the memory timing information from the
     SPD (Serial Presence Detect) eprom on the first memory module
     *only*, the motherboard could try to run the second (PC100)
     module at PC133 timings and cause problems. The solution would
     of course be to put the PC100 module in the first DIMM slot
     so that it's the module detected first.
(2) If the motherboard is an old board that came out before
     PC133 SDRAM, it might be confused by the memory timings it
     reads from the SPD eprom on the PC133 module and refuse to
     recognize it. The solution would be to enter the motherboard
     BIOS and manually set the memory timings to conservative (i.e.,
     PC100) values. (In other words, override the automatic SPD
     settings.)

Regards,
Bill

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