Does anyone know if using the /3GB boot.ini setting in XP will make any difference with Doom 3, or is this mainly for database applications and things like that?
/3GB
Increases the size of the user process address space from 2 GB to 3 GB (and therefore reduces the size of system space from 2 GB to 1 GB). Giving virtual-memory- intensive applications such as database servers a larger address space can improve their performance. For an application to take advantage of this feature, however, two additional conditions must be met: the system must be running Windows XP, Windows Server 2003, Windows 2000 Advanced Server or Datacenter Server and the application .exe must be flagged as a 3-GB-aware application.