VRAM and RAM have entirely different purposes, and are contained within completely separate parts of your system, that is if they are indeed separate. For most graphics cards, the RAM is contained within the card itself, but on some lower end laptops, it will be shared. Yours apparently uses the pre-installed VRAM, as with most systems. To my knowledge, there's no way to share between the two, and my only suggestion would be to purchase a better graphics card, as 512mb seems to not meet your needs. I'd also advise against expanding your RAM as 8GB is more than sufficient for even the highest quality games, and larger quantities would only be needed for intensive rendering/video editing, which relies on heavy amounts of memory, but not visual as in GFX cards.