I have a Toshiba Satelite l645D and when I go to my ATI Mobility Radeon HD 4200 settings it says it has a total of 1405 available graphics memory, but only 256 Video memory is dedicated... My laptop has plenty of RAM to give to the video card, and when I go to the BIOS theres no option for increasing the video ram whatsoever... Is there any way to do this?