Integrated video card, how do i tell how much video ram it has?

I am looking to buy a computer and most of them have an integrated video card that is built into the motherboard, how do i tell how much video ram it has and what type video card it is, all of the specs just say integrated|||An integrated card does not have its own ram, it shares with the cpu.|||it will tell you just how much memory the graphic card can go up to, cause you can manually change it less or more by borrewing more ram from your pc. most intergrated cards go up to 256 mb so whatever ram you have example 1gb you will loose 256mb of that for your graphic card. If it doesnt show you in the computer specs then you have to manually type that intergrated card on google to research just how much it can go up to.