What is the max memory xp supports?

Answer:
Being a 32 bit operating system XP will natively support up to 4 Gb of RAM (2^32). 1 Gb is reserved for the kernel and therefore userspace only sees 3 Gb.

Through some hackery they have managed to get some of their 32 bit OSes (namely Windows Server 2003 and Vista) to be able to use several times more physical RAM.
First answer by Robogymnast. Last edit by Robogymnast. Contributor trust: 65 [recommend contributor recommended]. Question popularity: 2 [recommend question].