no no....i know that!...that's not my point..it won't even BOOT with all 4 sticks in...I don't care if doesn't see all 4gb ...i already know that....but my system will boot with 3gb, but not 4gb..and i've already tested both sticks if you read the rest of my posts.....it might be voltage..i'm trying it out tomorrow to see....it SHOULD boot with 4gb..i know it won't READ 4gb..that's beyond my point and over bill gates head for designing his s*** like that but anyways..i just want to be able to not have to take a stick out every time i wanna switch between xp and linux...jeepers..