Intel says here that chipset 945GM
can have a max memory of 4gb
on the datasheet
it says up to 4gb as well.
and as the guy said on the other post
Maximum memory capacity may require the replacement of standard component with largest supported component available. On ThinkPad systems with an Intel 945GM, 945PM, GM965, or PM965 chipset, even though it is possible to physically install 4GB of memory, the actual amount of memory addressable by an operating system will be limited to 3GB. This limitation does not exist with the Intel GM965 and PM965 with the 64-bit operating systems Windows XP Professional 64-bit and Windows Vista 64-bit Editions.
but that is the issue, the chipset can have a max memory of 4gb, the socket can have a x64 core 2 duo proccessor, and i can install a x64 OS
i don't understand
why does the z61 support only 3gb ram then?
The Z61 is the same generation as the T60, which only supports 3gb ram. Even if you can use a x64 os, you can only use 3gb ram. Unless you have a x64 program, I would reccomend sticking with x86.
i don't have a x64 program, i was just trying to figure out what i will upgrade on my laptop since i decided to stick with it instead of buying a new one, and memory is one of the factors in the upgrade cpu question