“We previously reported that while the MacBook Pro Core 2 Duo can physically accomodate two 2 GB RAM modules for a total of 4 GB, Apple’s specs list the model as able to recognize a maximum of 3 GB of RAM. Today we have some some additional information regarding why the units can only recognize 3 GB, and the questionable nature of other manufacturers’ claims that their Core 2 Duo-based uportables can address up to 4 GB of RAM,” MacFixIt reports.
“The MacBook Pro Core 2 Duo presumably uses Intel’s 945PM chipset, which can physically handle 4 GB of DDR2 RAM. However, a number of items that must be stored in physical RAM space, and when RAM reaches 4 GB, there is some overlap. In other words, in a 3 GB RAM configuration, there is no overlap with the memory ranges required for certain system functions,” MacFixIt reports.
Full article here.