Q about XP

How do i know how many bit my XP is?
I have SP3 and XP pro, because hopefully in the future i'm plaing to build new machine for Christmas/b-day (like 20 days away from each other
)
Anyways i was wondering of XP pro SP3 could support 4 Gb of RAM
I have SP3 and XP pro, because hopefully in the future i'm plaing to build new machine for Christmas/b-day (like 20 days away from each other

Anyways i was wondering of XP pro SP3 could support 4 Gb of RAM
