Unless you only speak about office applications, browsing and the windows desktop and no gaming the 512MB should be good to display everything you need.

Is 512MB VRAM enough for gaming?

If modern games should run smoothly, you'll require a discrete graphics card with dedicated memory. While 128 or 256 MB VRAM no longer suffice graphically demanding titles, mid-range graphics cards should feature a minimum of 512 MB and high-end graphics cards at least 1024 MB VRAM.

Why is my VRAM only 512MB?

Re: My video card only shows 512 mb

Seems like your manufacturer of your laptop doesn't want you to increase the Integrated Graphics vRAM thus it is fixed. You can try and see if there is a newer BIOS for your laptop that might include that Setting.