accumulative

 

Motherboard Chipsets and the Memory Map

http://duartes.org/gustavo/blog/post/motherboard-chipsets-memory-map

The system memory that is reported in the System Information dialog box in Windows Vista is less than you expect if 4 GB of RAM is installed

http://support.microsoft.com/kb/929605

Physical Address Extension

http://en.wikipedia.org/wiki/Physical_address_extension

 

What Every Programmer Should Know About Memory
Ulrich Drepper
Red Hat, Inc.