XP resticted to 4gb

[.Geenie.]

I have changed to vista a couple of weeks ago and are now goin back to xp. yes i am upgrading back to xp.

 

But since i changed to vista i changed my DDR2 mem from 1.5gb to 4gb.

 

It is well known that xp is restricted to just 4gb but does this restriciotn include your video mem.