After installing ubuntu as my os and enabling nvidia graphics card i find that graphics memory is 512mb??

Question

but initially my laptops graphics is nVidia GeForce 8400M GS with 256MB DDR dedicated graphics memory..is it possible for it to take 512mb of memory??

Answer 1

Many memory cards will be sold with 512MB Memory followed by a small asterisk--which goes on to say that 256MB onboard and 256MB shared with/from the system. That's probably what you've got going on.