Since the Intel graphics controllers nowadays have dynamic RAM allocation - the amount of video RAM can vary depending on what you're doing - for example, while word processing, the graphics controller may only use ~4 MB, but when playing a game (hopefully not

), it can allocate as much as 64 MB (shared) from the main system memory.
All in all, if you had the money, buy a new videocard.

(mobo, if possible, if you obviously want an AGP)