Why is 4GB of RAM impossible for pre-santa rosa machines?!

ok, i know that older MBP's have an Intel 945PM chipset and i also know about the whole memory overlapping thing. BUT if the Intel chipset can handle 4GB of RAM is this a software issue or a hardware issue? and since OS 10.4.10 is a 32-bit system does that mean if i were to upgrade to leopard, which is 64-bit, this whole RAM issue would fix itself?
MacBook Pro   Mac OS X (10.4.10)   2.33GHz CPU, 2GB RAM

hey buddy didn't you read the top? i know about the memory overlapping thing! if the board can handle 4 gigs and the cpu has no problem with it. then why can't you have 4 gigs?
"a number of items that must be stored in physical RAM space, and when RAM reaches 4 GB, there is some overlap. "
-Inside the MacBook Pro’s 3GB RAM limitation
ok, well what is setting the number of items that must be stored in the physical RAM space? and is it possible to assign these functions a different space? instead of being between 3GB and 4GB, can't you move it to 4GB to 5GB?

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