im guessing its a prebuilt system such as dell or hp? go to run type "dxdiag" then go to the display tab at the top and on the left itll tell u all u need to know about it
or.. if you are in windows, right click on my computer, and find the device manager (something like that) it will give you information on your hardware. you could also use some software like freshdiagnose and that will tell you tons of info about your hardware.