The difference between 256mb Vram and 512mb Vram will not be as visibly significant as it is between 128mb and 256mb. There have been plenty of Youtube videos of 2.4's with 256mb running Crysis fine at decent resolutions (things like 1280 x 800 I believe) without the AA and AF (which you can't expect to run). If you want to run it at anything higher (and granted, why would you need to), then you shouldn't have bought a laptop.