On May 27, 2010, at 7:27 PM, tortoise wrote:
The Lombard has a 66mhz bus and so pc-133 may probably not work, it should be pc-66 or pc-100.
PC-133 usually will not work only because Apple had already abandoned this type of RAM before the PC-133 standard was adopted for Wintel laptops.
However, PC-133 SO-DIMMs which were designed to work in Apple laptops, mainly Wallstreet, Lombard and Pismo, will indeed work, its just that the RAM must be so-called "low-density" and must be one chip high (IOW, no stacked chips, as these are too thick for the processor card).
A Pismo will accept 2 x 512 MB of "low-density" RAM for a total of 1024 MB (1 GB). The thicks may be either "low-profie" or "high- profile" or both in any combination.
A Wallstreet or Lombard will accept 2 x 256 MB of "low-density" RAM for a total of 512 MB (0.5 GB). One stick may be "low-profile or "high-profile", but the other stick must be "low-profile"
Installing so-called "high-density" RAM in these machines will often result in the stick being read as one-half capacity.
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